Kathy spent ¹₇ of her salary on a washing machine and ²₅ of the remainder on a microwave oven. If she saved the remaining $396, 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 - ²₅
= ³₅

Washing Machine	Remainder		Total
1x5	6x5		7x5
	Microwave Oven	Savings
	2x6	3x6
5 u	12 u	18 u	35 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 5 is 30.

Total salary = 35 u

Amount spent of the washing machine = 5 u
Amount spent on the microwave oven = 12 u
Amount of savings = 18 u

18 u = 396

1 u = 396 ÷ 18 = 22

Kathy's salary
= 35 u
= 35 x 22
= $770

Answer(s): $770