Shannon spent ¹₈ of her money on some correction tapes. She spent ²₇ of the remaining money on some post-it pads and ³₅ of what was left on some rulers.

1. What fraction of her money was spent on rulers?
2. Given that the correction tapes cost $20 less than the rulers, find the sum of money that Shannon spent.

Correction Tapes	Remaining money
1	7
	Post-it Pads	Left
	2	5
		Rulers	Rest
1 u	2 u	3 u	2 u

(a)
Fraction of money left after spending on the correction tapes
= 1 - ¹₈
= ⁷₈

Fraction of remaining money after spending on the post-it pads
= 1 - ²₇
= ⁵₇

Fraction of what was left after spending on the rulers
= 1 - ³₅
= ²₅

Fraction of money that was spent on rulers = ³₈

(b)
Amount that Shannon spent on the correction tapes = 1 u
Amount that Shannon spent on the rulers = 3 u

Amount that the correction tapes cost less than the rulers
= 3 u - 1 u
= 2 u

2 u = 20

1 u = 20 ÷ 2 = 10

Amount that Shannon sent
= 1 u + 2 u + 3 u
= 6 u
= 6 x 10
= $60

Answer(s): (a) ³₈; (b) $60