Jean spent ²₁₁ of her money on some notebooks. She spent ⁴₉ of the remaining money on some pens and ⁴₅ of what was left on some post-it pads.

1. What fraction of her money was spent on post-it pads?
2. Given that the notebooks cost $20 less than the post-it pads, find the sum of money that Jean spent.

Notebooks	Remaining money
2	9
	Pens	Left
	4	5
		Post-it Pads	Rest
2 u	4 u	4 u	1 u

(a)
Fraction of money left after spending on the notebooks
= 1 - ²₁₁
= ⁹₁₁

Fraction of remaining money after spending on the pens
= 1 - ⁴₉
= ⁵₉

Fraction of what was left after spending on the post-it pads
= 1 - ⁴₅
= ¹₅

Fraction of money that was spent on post-it pads = ⁴₁₁

(b)
Amount that Jean spent on the notebooks = 2 u
Amount that Jean spent on the post-it pads = 4 u

Amount that the notebooks cost less than the post-it pads
= 4 u - 2 u
= 2 u

2 u = 20

1 u = 20 ÷ 2 = 10

Amount that Jean sent
= 2 u + 4 u + 4 u
= 10 u
= 10 x 10
= $100

Answer(s): (a) ⁴₁₁; (b) $100