Fraction problem

Question

Jeremy spends 3/12 of his pocket money each week. He saves 8/12 of what is left over. If he saves $5 per week, how much pocket money does Jeremy receive?

Answer 1

He spends 3/12 which means he has 9/12 left....

he saves 8/12 of the 9/12 remaining which is 72/144 = 1/2,

So 1/2 of the total amount is $5

Therefore, he has $10.

He spends 3/12 of that, which is 3/12 * $10 = 30/12 = 15/6 = 5/2 = $2.50

Then there is 10 - $2.50 = $7.50

He saves 8/12 of $7.50 = $5

He has $10