SOLUTION: A 3 x 5 photo graph is enlarged to 5 x 7 size.What is the percent increase in area.

The 3×5 photo's area is (3 in)×(5 in) = 15 in²
The 5×7 photo's area is (5 in)×(7 in) = 35 in²

To compare A to B, we divide A by B

To compare 35 in² to 15 in² we divide 35 by 15.

We do that and get that 35 in² is 2.333... times as many 
as 15 in².

That's 1 + 1.333... so it's one times PLUS 1.333... times

Answer: 1.333... times or 133.333% or % increase

Either way.

Edwin