Gem spent ¹₄ of her salary on a microwave oven and ²₅ of the remainder on a speaker. If she saved the remaining $252, how much was her salary?
Fraction of the salary spent on the microwave oven = ¹₄

Fraction of the salary on the remainder
= 1 - ¹₄
= ³₄

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

Microwave Oven	Remainder		Total
1x5	3x5		4x5
	Speaker	Savings
	2x3	3x3
5 u	6 u	9 u	20 u

The remainder and the total amount on the speaker and the savings are the same. Make the remainder and the total amount on the speaker and the savings the same.  LCM of 3 and 5 is 15.

Total salary = 20 u

Amount spent of the microwave oven = 5 u
Amount spent on the speaker = 6 u
Amount of savings = 9 u

9 u = 252

1 u = 252 ÷ 9 = 28

Gem's salary
= 20 u
= 20 x 28
= $560

Answer(s): $560