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# the average of 5 numbers is 7. the average of top 2 number is 3 and average of last two number is 6 . what is the third number

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### Mohammed

Guys, does anyone know the answer?

get the average of 5 numbers is 7. the average of top 2 number is 3 and average of last two number is 6 . what is the third number from screen.

## If the average of five numbers is 10 , and the fifth number is 6 , find the average of the first four numbers.

Click here👆to get an answer to your question ✍️ If the average of five numbers is 10 , and the fifth number is 6 , find the average of the first four numbers. Question

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## 13

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## [Solved] The average of 3 numbers is 7 and the average of first two n

Given: The average of 3 numbers = 7 The average of the first 2 numbers = 4 Formula used: Average = (Sum of values/number of values) Calculation: The avera Home Quantitative Aptitude Average

## The average of 3 numbers is 7 and the average of first two numbers is 4. What is the third number?

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## Detailed Solution

Given:

The average of 3 numbers = 7

The average of the first 2 numbers = 4

Formula used:

Average = (Sum of values/number of values)

Calculation:

The average of 3 numbers = 7

Sum of 3 numbers ⇒ 7 × 3 ⇒ 21

The average of 2 numbers = 4

Sum of 2 numbers ⇒ 4 × 2 ⇒ 8

Third Number = 21 – 8 = 13

∴ The third number is 13.

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## More Average Questions

Q1. The average of 25 numbers is 48.2. If the average of the first 10 numbers is 47 and the average of the last 12 numbers is 49, then find the average of 58, 69 and the remaining numbers.Q2. Renu's marks were wrongly entered as 99 in place of 9. Due to this error, the average marks of the class were 2.25 more than the actual average. What is the number of students in the class?Q3. Find the value of

2k+11

, where k is average of 16, 25, 13, 26 and 15.

Q4. The average of 30 numbers is 55. The average of the first 15 numbers is 51 and the average of the last 12 numbers is 56. What is the average of 68, 74 and the remaining 3 numbers?Q5. The mean of a certain number of observations is 12. If one observation is removed and the mean remains unaltered, then the removed observation is:Q6. The average height of a class of 30 students is 1 m 50 cm. 6 new students increase the average height to 1 m 55 cm. Determine the average height of the 6 new students.Q7. The sum of three consecutive odd numbers is 165. What is the sum of the largest number and twice the smallest number?Q8. The average age of all the 16 professors of LK University is 52 years. After four years what will be the average age of all the 16 professors if there is no retirement or recruitment?Q9. The average of five numbers is 78. If the average of the first two numbers is 54 and the average of the last two numbers is 63, then the third numbers is:Q10. There are four different numbers. The average of the first three numbers is three times the fourth number, and the average of all the four numbers is 55. What is the average of the first three numbers?

स्रोत : testbook.com

## The average of 5 numbers is 9 and the average of the last three numbers is 5. What is the average of the first two numbers?

Answer (1 of 12): \frac{x_{1}+x_{2}+x_{3}+x_{4}+x_{5}}{5} = 9\\ \frac{x_{3}+x_{4}+x_{5}}{3} = 5\\ x_{3}+x_{4}+x_{5} = 15\\ x_{1}+x_{2}+x_{3}+x_{4}+x_{5} = 45\\ x_{1}+x_{2} = 45-(x_{3}+x_{4}+x_{5})\\ x_{1}+x_{2} = 45-15 = 30\\ \text{ Average } = \frac{\text{Sum of numbers}}{\text{ No of numb... The average of 5 numbers is 9 and the average of the last three numbers is 5. What is the average of the first two numbers?

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Sort Niranjan Krishna

Loves Mathematics and Physics.Author has 143 answers and 80.8K answer views2y

x 1 + x 2 + x 3 + x 4 + x 5 5 =9 x1+x2+x3+x4+x55=9 x 3 + x 4 + x 5 3 =5 x3+x4+x53=5 x 3 + x 4 + x 5 =15 x3+x4+x5=15 x 1 + x 2 + x 3 + x 4 + x 5 =45 x1+x2+x3+x4+x5=45 x 1 + x 2 =45−( x 3 + x 4 + x 5 ) x1+x2=45−(x3+x4+x5) x 1 + x 2 =45−15=30 x1+x2=45−15=30 Average = Sum of numbers No of numbers

Average =Sum of numbers No of numbers

∴ Average = x 1 + x 2 2 ∴ Average =x1+x22 = 30 2 =302 =15 =15 Related questions

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The average of 9 numbers is 18. The average of the first 5 numbers is 22 and that of the last 3 numbers is 15. What are the 6th numbers?

Sumanta Kumar Nandi

Senior Section Engineer at Ministry of Railways, India (1988–present)2y

Total of 5 numbers is 5×9=45

Total of last 3 numbers is 5×3=15

Total of remaining 2 numbers is 45–15=30

Average of 2 numbers is 30÷2=15

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Nandan Singh

Private Tutor (2001–present)Author has 619 answers and 668.2K answer views2y

Sum of all five numbers =5*9=45

Sum of the last 3 numbers =3*5=15

Sum of the first 2 numbers =45–15=30

Average of the first two numbers. =30/2=15.

Ankaleshwar Shiv

Algebra, Geometry and TrigonometryAuthor has 94 answers and 163.7K answer views3y

Related

The average of three numbers is 29. The average of two of these numbers is 38. What is the third number?

Let the three numbers be x, y and z.

As per question: (x+y+z)/3 = 29

so, x+y+z = 29*3 = 87

Also,

average of any two numbers i.e., (x+y)/2 = 38

so, x+y = 38*2 = 76

Hence, The third number z = 87 - 76 = 11

Related questions

What is the average of 5 and what number is 9?

The average of 8 numbers is 20 and average of 5 numbers is 14. What is the average of 3 numbers?

The average of 5 numbers is 14. The average of three of the numbers is 12. What is the average of the other two numbers?

The average (mean) of three numbers is 10. The first two numbers are 10 and 4. What is the third number?

The average of 25 numbers is 48.2. If the average of the first 10 numbers is 47 and the average of the last 12 numbers is 49, what is the average of 58, 69 and the remaining numbers?

Udit Gautam

Former Member at The Placement Cell, PGDAV College (2022–2022)2y

Let the five nos. be a, b, c, d and e.

Given, (a+b+c+d+e)/5=9 So, =>a+b+c+d+e=5×9=45 Also given, (c+d+e)/3=5 So, =>c+d+e=5×3=15 So, =>a+b+15=45 =>a+b=45–15=30 Now, =(a+b)/2 =30/2 =15

Hence, the average of first two numbers is 15

Hope it helps Thank you Roland Neville

Former Retired Teacher, Formerly in Engineering.Author has 797 answers and 180.7K answer views2y

Related

The average of five numbers is six. Out of these five numbers, the average of three numbers is four. What will the average be of the other two numbers?

Average of all five is 6 → total is 30

Average of three is 4 → Total of the three is 12

→ Total of the last two is 18

→ Average of the last two is 9

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Mohammed 8 day ago

Guys, does anyone know the answer?