Zoe spent $136 on some notebooks, pencils and markers. The number of notebooks she bought was ¹₂ the number of pencils. The number of markers she bought was ²₅ the number of pencils. The ratio of the amount of money she spent on the notebooks, pencils and markers was 3 : 9 : 5. The pencils were sold at 5 for $6. Find the price of 1 notebook.

Amount spent
Notebooks	Pencils	Markers	Total
3 u	9 u	5 u	$136

Total amount that Zoe spent on notebooks, pencils and markers
= 3 u + 9 u + 5 u
= 17 u

17 u = 136

1 u = 136 ÷ 17 = 8

Amount that Zoe spent on pencils
= 9 u
= 9 x 8
= $72

Number of sets of pencils of 5 bought
= 72 ÷ 6
= 12

Number of pencils that Zoe bought
= 12 x 5
= 60

Number of items bought
Notebooks	Pencils	Markers	Total
1x5	2x5
	5x2	2x2
5 p	10 p	4 p	19 p

The number of pencils bought is repeated.  Make the number of pencils bought is the same.  LCM of 2 and 5 is 10.

Number of pencils that Zoe bought = 10 p

10 p = 60

1 p = 60 ÷ 10 = 6

Number of notebooks that Zoe bought
= 5 p
= 5 x 6
= 30

Amount that Zoe spent on notebooks
= 3 u
= 3 x 8
= $24

Price of 1 notebook
= 24 ÷ 30
= $0.80

Answer(s): $0.80