Milan puts 1/4 of her lawn-mowing money in savings and uses 1/2 of the remaining money to pay back her sister. if she has $15 left, how much did she have at first?

Milan has 3/4 of her money left after spending it. She uses half the remaining money to pay back her sister so she has the other half of the remaining money left which is $15. Hence, amount of money left after saving= 15×2 =$30, which is 3/4 of the total initial amount. Hence initial amount = 30× (4/3) = $40