The photographer got the baby to smile in 30% of the photos he took. If the baby smiled in 12 photos, how many photos did the photographer
30%=12 Pictures
30/3=10%
12/3=4 Pictures
10%=4 Pictures
10*10=100%
4*10=40 Pictures
So, the photographer took 40 pictures.
You have
30%:12
10%:4
10*10%:4*10
100%:40
So, the photographer took 40 pics