Vanessa spent ²₃ of her money on 12 staplers and 7 notebooks. The cost of each notebook is 4 times the cost of each stapler. She bought some more staplers with ³₄ of her remaining money. How many staplers did Vanessa buy altogether?

12 staplers + 7 notebooks		Remaining  amount		Total amount
2 p = 40 u		1 p = 20 u		3 p
12 staplers	7 notebooks	More staplers	Left
		3	1
12 u	28 u	15 u

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

Cost of 12 staplers = 12 x 1 u = 12 u
Cost of 7 notebooks = 7 x 4 u = 28 u

Cost of 12 staplers + 7 notebooks
= 12 u + 28 u
= 40 u

2 p = 40 u

1 p = 40 u ÷ 2 = 20 u

Amount of remaining money that Vanessa spent on buying more staplers
= ³₄ x 20 u
= 15 u

Number of staplers that Vanessa bought with ³₄ of her remaining money
= 15 u ÷ 1 u
= 15

Total number of staplers that Vanessa bought
= 12 + 15
= 27

Answer(s): 27