Xylia spent ¹₈ of her salary on a refrigerator and ²₅ of the remainder on a speaker. If she saved the remaining $672, how much was her salary?
Fraction of the salary spent on the refrigerator = ¹₈

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

Fraction of the remainder on savings
= 1 - ²₅
= ³₅

Refrigerator	Remainder		Total
1x5	7x5		8x5
	Speaker	Savings
	2x7	3x7
5 u	14 u	21 u	40 u

The remainder and the total amount on the speaker and the savings are the same. Make the remainder and the total amount on the speaker and the savings the same.  LCM of 7 and 5 is 35.

Total salary = 40 u

Amount spent of the refrigerator = 5 u
Amount spent on the speaker = 14 u
Amount of savings = 21 u

21 u = 672

1 u = 672 ÷ 21 = 32

Xylia's salary
= 40 u
= 40 x 32
= $1280

Answer(s): $1280