Shiyun spent ³₄ of her money on 12 notebooks and 8 markers. The cost of each marker is 3 times the cost of each notebook. She bought some more notebooks with ³₄ of her remaining money. How many notebooks did Shiyun buy altogether?

12 notebooks + 8 markers		Remaining  amount		Total amount
3 p = 36 u		1 p = 12 u		4 p
12 notebooks	8 markers	More notebooks	Left
		3	1
12 u	24 u	9 u

Cost of 1 notebook = 1 u
Cost of 1 marker = 3 u

Cost of 12 notebooks = 12 x 1 u = 12 u
Cost of 8 markers = 8 x 3 u = 24 u

Cost of 12 notebooks + 8 markers
= 12 u + 24 u
= 36 u

3 p = 36 u

1 p = 36 u ÷ 3 = 12 u

Amount of remaining money that Shiyun spent on buying more notebooks
= ³₄ x 12 u
= 9 u

Number of notebooks that Shiyun bought with ³₄ of her remaining money
= 9 u ÷ 1 u
= 9

Total number of notebooks that Shiyun bought
= 12 + 9
= 21

Answer(s): 21