Olivia spent ¹₈ of her salary on a microwave oven and ³₄ of the remainder on a food processor. If she saved the remaining $231, 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 - ³₄
= ¹₄

Microwave Oven	Remainder		Total
1x4	7x4		8x4
	Food Processor	Savings
	3x7	1x7
4 u	21 u	7 u	32 u

The remainder and the total amount on the food processor and the savings are the same. Make the remainder and the total amount on the food processor and the savings the same.  LCM of 7 and 4 is 28.

Total salary = 32 u

Amount spent of the microwave oven = 4 u
Amount spent on the food processor = 21 u
Amount of savings = 7 u

7 u = 231

1 u = 231 ÷ 7 = 33

Olivia's salary
= 32 u
= 32 x 33
= $1056

Answer(s): $1056