The average of a and b is 40, and the average of b and c is 45. What is c − a?

A. 10

B. 5

C. 15

D. 20

Doubtly AI Asked 27 Oct 2026 AI-generated · not yet verified ssc cgl Save WhatsApp Report

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Best answer

Answer: A. 10

Answer: (A) 10

a + b = 80 and b + c = 90. Subtracting, c − a = 10.

Trap: 5 is the difference of the averages, not of the sums.

Doubtly AI · 27 Oct 2026 AI-generated · not yet verified Report

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