K:P=2:5 P+75 it is 4:15 at first, P=5 units so we have 2:5 and 4:15 since the K units didn't change we conver them to the same 2:5 times 2:2=4:10 so from 4:10 to 4:15 is a change of 75 in the right side therefor 75=5 units so 75/5=15/1= 1 unit so at first K=4 units=4 times 1 unit=4 times 15=60 P=10 units so 10 times 15=150