$ 100 is divided amongst a , b and c so that a may get 1 / 4 as much as b and c together , b may get 3 / 5 as much as a and c together , then the share of a is
"a : ( b + c ) = 1 : 4 a ' s share = 100 * 1 / 5 = $ 20 answer is b"
multiply(divide(100, add(divide(1, 4), const_1)), divide(1, 4))