Which fraction is equivalent to 72%
a: 7 1/5
b: 18/25
c: 7/200
d: 9/25

The best thing to do is to simply the fraction and you can do this by dividing it by 2.
72/2= 36
it then becomes 36/50
You can then divide again 
36/2= 18
It then becomes 18/25
Therefore, your answer is B
Hope this helps :) 

One that half its volume