Hazel spent ⁴₅ of her money on 12 notebooks and 9 staplers. The cost of each stapler is 4 times the cost of each notebook. She bought some more notebooks with ⁵₆ of her remaining money. How many notebooks did Hazel buy altogether?

12 notebooks + 9 staplers		Remaining  amount		Total amount
4 p = 48 u		1 p = 12 u		5 p
12 notebooks	9 staplers	More notebooks	Left
		5	1
12 u	36 u	10 u

Cost of 1 notebook = 1 u
Cost of 1 stapler = 4 u

Cost of 12 notebooks = 12 x 1 u = 12 u
Cost of 9 staplers = 9 x 4 u = 36 u

Cost of 12 notebooks + 9 staplers
= 12 u + 36 u
= 48 u

4 p = 48 u

1 p = 48 u ÷ 4 = 12 u

Amount of remaining money that Hazel spent on buying more notebooks
= ⁵₆ x 12 u
= 10 u

Number of notebooks that Hazel bought with ⁵₆ of her remaining money
= 10 u ÷ 1 u
= 10

Total number of notebooks that Hazel bought
= 12 + 10
= 22

Answer(s): 22