A 30 in. by 40 in. photo is reduced so that its width (the shorter side) is 24 in. Find the scale factor used. What is the length (the longer side) of the reduced photo? (Points : 4)
10 in.
16 in.
32 in.
38 in.

Question

A 30 in. by 40 in. photo is reduced so that its width (the shorter side) is 24 in.  Find the scale factor used.  What is the length (the longer side) of the reduced photo? (Points : 4)
       10 in.
       16 in.
       32 in.
       38 in.

anonymous · Answer

Like my math teacher always says Proportion are your friends.
$$\frac{ 24 }{ 30 }=\frac{ x }{ 40 }$$
Cross multiply and see what you get.

sammixboo · Answer

Yes, cross multiply 24 by 40 first and tell us what you got! There is still some more steps :P

anonymous · Answer

I got it thanks