Irene spent ¹₈ of her salary on a microwave oven and ²₃ of the remainder on a kettle. If she saved the remaining $175, how much was her salary?
Fraction of the salary spent on the microwave oven = ¹₈

Fraction of the salary on the remainder
= 1 - ¹₈
= ⁷₈

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

Microwave Oven	Remainder		Total
1x3	7x3		8x3
	Kettle	Savings
	2x7	1x7
3 u	14 u	7 u	24 u

The remainder and the total amount on the kettle and the savings are the same. Make the remainder and the total amount on the kettle and the savings the same.  LCM of 7 and 3 is 21.

Total salary = 24 u

Amount spent of the microwave oven = 3 u
Amount spent on the kettle = 14 u
Amount of savings = 7 u

7 u = 175

1 u = 175 ÷ 7 = 25

Irene's salary
= 24 u
= 24 x 25
= $600

Answer(s): $600