Question

A copy was made of Sally's autograph. The copy resize the photo so that it measures 4 inches wide by 7 inches long. If the actual painting is 16 inches wide, what is it's length ?

Answer 1

the ratio of width to length will be the same  so

4/7 = 16/l
l = (7*16) / 4 = 7 * 4 = 28

length = 28 inches