Shiyun spent ²₃ of her salary on a blender and ²₅ of the remainder on a microwave oven. If she saved the remaining $72, how much was her salary?
Fraction of the salary spent on the blender = ²₃

Fraction of the salary on the remainder
= 1 - ²₃
= ¹₃

Fraction of the remainder on savings
= 1 - ²₅
= ³₅

Blender	Remainder		Total
2x5	1x5		3x5
	Microwave Oven	Savings
	2x1	3x1
10 u	2 u	3 u	15 u

The remainder and the total amount on the microwave oven and the savings are the same. Make the remainder and the total amount on the microwave oven and the savings the same.  LCM of 1 and 5 is 5.

Total salary = 15 u

Amount spent of the blender = 10 u
Amount spent on the microwave oven = 2 u
Amount of savings = 3 u

3 u = 72

1 u = 72 ÷ 3 = 24

Shiyun's salary
= 15 u
= 15 x 24
= $360

Answer(s): $360