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    there are 14 people in a family and the average age of all the family members is 30 years. a new baby born in a family, after 4 years what will be the average age of the all family members?

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    get there are 14 people in a family and the average age of all the family members is 30 years. a new baby born in a family, after 4 years what will be the average age of the all family members? from screen.

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    Home » Quantitative Aptitude » Arithmetic » Average Level 1 » all » Average Quiz 10

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    1

    There are 14 people in a family and the average age of all the family members is 30 years. A new baby born in a family, After 4 years what will be the average age of the all family members?

    A 30 years B 35 years C 28 years D 33 years E None of these » Explain it 2

    Mahima bought 20 kg pasta for Rs 30 per kg, m kg pasta for Rs 35 per kg and (m + 4) kg pasta for Rs 25 per kg. She mixed all type of pasta together and the average cost price of 1 kg pasta is Rs 29.6. Find the quantity of pasta that is bought at Rs 25 per kg.

    A 12 kg B 20 kg C 13 kg D 22 kg E None of these » Explain it 3

    The average salary per head of all the workers of an office is Rs 95. The average salary of 15 officer is Rs 525 and the average salary of the rest is Rs 85. Find the total numbers of workers.

    A 645 B 660 C 670 D 650 E None of these » Explain it 4

    The average weight of three students A, B and C is 88.5kgs while the average weight of the other three students, D , F and G is 83.5 kg. What is the average weight of A, B, C, F and J?

    A 83.8 kg B 82.4 kg C 83.2 kg D Data inadequate E None of these » Explain it 5

    There are 25 students in a class and the average of their ages is 15 years. The average age of the first 12 students is 14 and the average age of the last 12 students is 16. If the age of Amrutha is 5 years more than the age of 13th student, find the age of Amrutha.

    A 12 B 15 C 20 D 25 E 30 » Explain it 65 Shares Share Prev 1 2 Next Previous Excercise Next Excercise

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    Average Quiz 10 for SBI Clerk Pre, IBPS Clerk Pre

    In this Arithmetic Average Quiz 10, you will practice question relation to bank and Insurance like  SBI Clerk Pre, IBPS Clerk Pre, IBPS RRB Pre, Railways, UIIC, LIC, NIACL, NICL, OICL and other competive exams

    Here we are going to discuss about Average concept, Tricks and Shortcuts for all bank, SSC, Insurance and Railways Exams.

    Average is most important part for all competitive exams, in each exam generally one has asked from Average chapter.

    Let discuss about Average with suitable examples

    Introduction:

    An average or an arithmetic mean of given data is the sum of the given observations divided by number of observations.

    Average =  ( Sum of observations ) .

    Numbers of observations

    For example, if a batsman scores 35, 45 and 37 runs in first, second and third innings respectively, then his Average runs in 3 innings

    = 35 + 45 + 37  = 39 runs.

    3

    Therefore, the two mostly used formulas in this chapter are:

    Average =  Total of data

    No. of data &

    Total = Average × No. of data

    Properties of Average:1. Average of a given data is less than the greatest observation and greater than the smallest observation of the given data.

    For example, average of 3, 7, 9 and 13

    =  3 + 7 + 9 + 13  =  32  = 8

    4 4

    Clearly, 8 is less than 13 and greater than 3.

    2. If the observations of given data are equal, then the average will also be the same as observations.

    For example, average of 6, 6, 6 and 6 will be 6 because

    =  6 + 6 + 6 + 6  =  24  = 6

    4 4

    3. If 0 (zero) is one of the observation of a given data then that 0 (zero) will also be included while calculation average.

    For example, average of 3, 6 and 0 is 3 because

    =  3 + 6 + 0  =  9  = 3

    3 3

    Remember

    • If the value of each item in a group is increased/decreased by the same value x, then the average of the group also increases/decreases by x. For instance, if the income of each person in a group increases by 15, the average income of the group also increases by Rs. 15.

    This is valid only when the value of each item increases/decreases by the same amount.

    • If the average age of group of people is x years, then their average age after n years will be (x + n) and their average age n years ago would have been (x – n) years.

    This is because with each passing year, each person’s age increases by 1 and vice versa.

    • If the value of each item in a group is multiplied/divided by the same value x (where x ≠ 0 in the case of division), then the average of the group also gets multiplied/divided by x.

    स्रोत : www.smartkeeda.com

    There are 14 people in a joint family and the average age of all the family members is 30 years. Now, a baby boy is born in that family. After 4 years

    There are 14 people in a joint family and the average age of all the family members is 30 years. Now, a ... years 2. 33 years 3. 32 years 4. 30 years

    There are 14 people in a joint family and the average age of all the family members is 30 years. Now, a baby boy is born in that family. After 4 years

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    [Solved] In a family of 14 members, the average age of all the family

    Given:              A family consists of 14 members. The average age of the family of 14 memb

    Home Quantitative Aptitude Average

    Question

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    In a family of 14 members, the average age of all the family members is 30 years. A new baby born in a family, Find the average age of all the family members after 4 years?

    This question was previously asked in

    Navik Quantitative Aptitude 21 March 2021 (All Shifts) Questions

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    23 years 32 years 30 years 35 years

    Answer (Detailed Solution Below)

    Option 2 : 32 years Crack with

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    Detailed Solution

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    Given: 

    A family consists of 14 members.

    The average age of the family of 14 members is 30 years.

    Formula:

    Sum of observations = Average × Number of observations.

    Calculation:

    According to the question given,

    The average age of a family consists of 14 members is 30 years.

    Now according to the formula used,

    The total age of all family members:

    ⇒ 30 × 14 = 420

    New baby born and after 4 years the total age of all the members

    ⇒ 420 + 15 × 4 ⇒ 420 + 60 ⇒ 480

    The average age of all the members after 4 years:

    ⇒ 480/15 ⇒ 32 years

    The average age of all the family members after 4 years is 32 years.

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    More Average Questions

    Q1. If the average of m numbers is n2 and of n numbers is m2 then average of (m + n) numbers will be-Q2. When 15 is included in a list of natural numbers, their mean is increased by 2. When 1 is included in this new list, the mean of the numbers in the new list is decreased by 1. How many numbers were there in the original list?Q3. If the average of a, b, c is M and ab + bc + ca = 0, then the average of a2, b2, c2 isQ4. There are three positive numbers. One-third of the average of all the three numbers is 8 less than the greatest number. The average of the smallest and the second smallest number is 8 . What is the greatest number?Q5. If the average of the number, 1, 2, 3, .... 98, 99, x is 100 x then the value of x isQ6. The average age of 35 children of the class is 16 years. 15 more children joined whose average age is 14 years. What is the average age of all the 50 children together?Q7. Shyam bought 5 shirts at Rs. 1250 each, 4 trousers at Rs. 950 each and 12 pairs of shoes at Rs. 2450 each. What is the average expenditure per article?Q8. The average weight of  A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is :Q9. A library has an average of 510 visitors on Sunday and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is :Q10. In an examination, a pupil's average marks were 63 per paper. If he had obtained 20 more marks for his Geography paper and 2 more marks for his History paper, his average per paper would have been 65. How many papers were there in the examination?

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