If 42a + 42b = 672, then what is the average of a and b ?
2021
If 42a + 42b = 672, then what is the average of a and b ?
- A.
6
- B.
8
- C.
7
- D.
9
Attempted by 108 students.
Show answer & explanation
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)