Xuan spent ¹₈ of her salary on a washing machine and ²₃ of the remainder on a juicer. If she saved the remaining $168, how much was her salary?
Fraction of the salary spent on the washing machine = ¹₈

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

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

Washing Machine	Remainder		Total
1x3	7x3		8x3
	Juicer	Savings
	2x7	1x7
3 u	14 u	7 u	24 u

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

Total salary = 24 u

Amount spent of the washing machine = 3 u
Amount spent on the juicer = 14 u
Amount of savings = 7 u

7 u = 168

1 u = 168 ÷ 7 = 24

Xuan's salary
= 24 u
= 24 x 24
= $576

Answer(s): $576