Question

A photographer charges $12 for a set of 20 pictures. Each picture cost the same amount. At this rate, how many pictures cost $30?

Answer 1

12/20 is 0.6 so 0.6 is the unit rate 0.6 x 30 is 18 hope this gets you the answer your looking for

Answer 2

50 picture would cost $30.

Hope this helps!