Ivory spent ¹₆ of her salary on a microwave oven and ³₄ of the remainder on a vacuum cleaner. If she saved the remaining $140, how much was her salary?
Fraction of the salary spent on the microwave oven = ¹₆

Fraction of the salary on the remainder
= 1 - ¹₆
= ⁵₆

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

Microwave Oven	Remainder		Total
1x4	5x4		6x4
	Vacuum Cleaner	Savings
	3x5	1x5
4 u	15 u	5 u	24 u

The remainder and the total amount on the vacuum cleaner and the savings are the same. Make the remainder and the total amount on the vacuum cleaner and the savings the same.  LCM of 5 and 4 is 20.

Total salary = 24 u

Amount spent of the microwave oven = 4 u
Amount spent on the vacuum cleaner = 15 u
Amount of savings = 5 u

5 u = 140

1 u = 140 ÷ 5 = 28

Ivory's salary
= 24 u
= 24 x 28
= $672

Answer(s): $672