One side of a square is 5n inches long. Another side is n + 16 inches long. How long is a side of the square?

A. 16 in

B. 5 in

C. 4 in

D. 20 in

I agree! The answer would be C the others don't make sense when worked out

Its a square.

So 5n = n + 16

Therefore 4n = 16 (taking one n from each side).

So n = 16/4 which is simplied as : 4.

Double check by putting 4 in the equation where n is, and it makes sense, so that is the right answer.

Your answer is c.