Jim spent 3/5 of his salary on transport and spent 1/8 of the remaining salary on food. He gave 1/10 of his salary to his mother and had $1325 left.
(a) What fraction of his salary did he spend on food?
(b) What was the amount of salary?
Let Jim's salary be J.
Jim spends 3/5 of his salary on transport. J-3/5J=2/5J is left.
1/8 of his remaining salary is (1/8)*(2/5J)=2/40J=1/20J, which is how much he spends on food.
He gives 1/10J to his mother.
So J-3/5J-1/20J-1/10J=5/20J=1/4J left, and this amount is equal to $1325.
(a) Jim spends 1/20 of his salary on food ($265)
(b) Jim's salary is 4*1325=$5300.