When a equation uses 'of', it usually means multiplication and 'is' means equal.
4/5 x P= 48
However, you want to figure out what P is before answering 3/5.
(4/5)(P)=48 Divide 4/5 by both side
P=60
Then you want to find what 3/5 of P is. Since we know what P is, we can figure out the answer.
X= 3/5 (60)
x= 36 so the answer is D.