Betty spent ¹₇ of her salary on a washing machine and ³₄ of the remainder on a microwave oven. If she saved the remaining $105, how much was her salary?
Fraction of the salary spent on the washing machine = ¹₇

Fraction of the salary on the remainder
= 1 - ¹₇
= ⁶₇

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

Washing Machine	Remainder		Total
1x2	6x2		7x2
	Microwave Oven	Savings
	3x3	1x3
2 u	9 u	3 u	14 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 6 and 4 is 12.

Total salary = 14 u

Amount spent of the washing machine = 2 u
Amount spent on the microwave oven = 9 u
Amount of savings = 3 u

3 u = 105

1 u = 105 ÷ 3 = 35

Betty's salary
= 14 u
= 14 x 35
= $490

Answer(s): $490