If 20a + 20b = 160, then what is the average of a and b?
Show answer & explanation
Correct answer: B
Explanation
Given:
20a + 20b = 160
According to the formula:
Average = (a + b) / 2
20(a + b) = 160
a + b = 160 / 20 = 8
Average = (a + b) / 2 = 8 / 2 = 4