Question

Sally is photocopying a picture. The original picture was 4 inches wide and 6 inches long. The new copy is 16 inches wide. How long is the new copy of the picture?

Answer 1

set up a proportion

(old width)/(old length) = (new width)/(new length)

plugging things in

4/6 = 16/x

solve for x

Answer 2

you can cross multiply and get 4x=6 times 16