Its impossible for there to be 2.5 children so im assuming you meant 25.
therefore
25= 100%
100/14= 7.1
7.1% of Mr. carters class were girls
Y=4 and I'm not sure on the second one sorry
24/108= 6/27 (divided by 4)
6/27= 2/9 (divided by 3) or 0.222222
It could be miles squared, inches squared, and even centimeters squared (anything squared)