If 42a + 42b = 672, then what is the average of a and b ?

2021

Answer: B. 8 — Solution Given: 42a + 42b = 672 Factor out 42 from the left-hand side: 42(a + b) = 672 Divide both sides by 42: a + b = 672/42 = 16 The average of a and b is:…

A.
6
B.
8
C.
7
D.
9

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Correct answer: B

Solution

Given:

42a + 42b = 672

Factor out 42 from the left-hand side:

42(a + b) = 672

Divide both sides by 42:

a + b = 672/42 = 16

The average of a and b is:

(a + b)/2 = 16/2 = 8

Answer: 8 (Option B)

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