Blake and Adam have raised a total of $100. Blake raised 25% as much money as Adam. How much less money did Blake raise than Adam?
B + A =100
B = .25A
So
.25A + A = 100
1.25A = 100
A = 100 /1.25 = 80
B = .25A = .25(80) = 20
Blake raised 80 - 20 = $60 less
+103 
