If the average of 7 numbers is 35 and the average of first 4 is 32, average of last 4 is 38. What is the 4th number? MCQ with Answer and Explanation

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If the average of 7 numbers is 35 and the average of first 4 is 32, average of last 4 is 38. What is the 4th number?

A. 30

B. 28

C. 35

D. 32

Answer: Option C

Solution (By JKSSB Mock Tests)

Sum of 7 = 7×35=245. Sum first 4=4×32=128. Sum last 4=4×38=152. 4th number = 128 + 152 - 245 = 35.

This question belongs to: Maths Average

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Question #1

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Average of 10 numbers 2580. If average of 6 is 2575, average of remaining 4?

A. 2587.5

B. 2586

C. 2585

D. 2590

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Correct Answer: Option A

Explanation:
Sum10=25800. Sum6=15450. Remaining=10350. Average=2587.5.

This question belongs to: Maths Average

Question #2

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What is the average of all odd numbers from 1 to 19?

A. 9.5

B. 10.5

C. 10

D. 9

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Correct Answer: Option C

Explanation:
Odd numbers: 1,3,5,...,19. There are 10 terms. Sum = n^2 =10^2=100. Average=100/10=10.

This question belongs to: Maths Average

Question #3

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The average of 10 numbers is increased by 2 when one number 15 is replaced by another. What is the new number?

A. 35

B. 25

C. 30

D. 40

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Correct Answer: Option A

Explanation:
Increase in sum =10×2=20. New number =15+20=35.

This question belongs to: Maths Average

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