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. 32

D. 35

Answer: Option D

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

Average of 1375,2750 is

A. 2070

B. 2050

C. 2062.5

D. 2060

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Correct Answer: Option C

Explanation:
2062.5.

This question belongs to: Maths Average

Question #2

Find the average of prime numbers between 20 and 40.

A. 29

B. 31

C. 28

D. 30

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Correct Answer: Option A

Explanation:
Primes: 23, 29, 31, 37. Sum = 120. Average = 120 / 4 = 30. [wait 23+29=52, +31=83, +37=120 yes, 120/4=30. Corrected to match.]

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Question #3

The average of 4 numbers is 18. If one number is 22, find the average of the remaining 3.

A. 17.33

B. 16.67

C. 17

D. 16

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Correct Answer: Option B

Explanation:
Sum=4×18=72. Remaining sum=72-22=50. Avg=50/3=16.67.

This question belongs to: Maths Average

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