If 5r = 20, what does 15r + 8 equal?

Question

The question is asking if the test-taker realizes multiples of a variable are related to the answer.

Answer 1

Note that the coefficient of the question is 3 times what was originally known:

If 5r = 20; then we have 15r; noting that 15r is three (3) times the 5r; plus we are to add eight (8)

If 5r = 20; then 15r = 60; then, we are to add 8 (because the question asks: 15r + 8):

So, 15r + 8 = 3 x 20 + 8 = 68

So, one would select the answer of 68 from the multiple choice selections.