Question

A photo that measures 5 in. by 7 in. is enlarged to 7.5 in. by `x` in. What is `x`?

Answer 1

`x=10.5`

Explanation:

The original photo and the enlarged one must be similar.
Therefore, the ratio of the two edges are same.

`5:7.5=7:x`
`5*x=7.5*7`
`5x=52.5`
`x=10.5`

The longer side of the enlarged photo is `10.5` inches.