Fiona spent ¹₈ of her salary on a toaster oven and ³₅ of the remainder on a television set. If she saved the remaining $420, how much was her salary?
Fraction of the salary spent on the toaster oven = ¹₈

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

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

Toaster Oven	Remainder		Total
1x5	7x5		8x5
	Television Set	Savings
	3x7	2x7
5 u	21 u	14 u	40 u

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

Total salary = 40 u

Amount spent of the toaster oven = 5 u
Amount spent on the television set = 21 u
Amount of savings = 14 u

14 u = 420

1 u = 420 ÷ 14 = 30

Fiona's salary
= 40 u
= 40 x 30
= $1200

Answer(s): $1200