Sabrina spent ²₃ of her money on 13 staplers and 5 markers. The cost of each marker is 3 times the cost of each stapler. She bought some more staplers with ⁶₇ of her remaining money. How many staplers did Sabrina buy altogether?

13 staplers + 5 markers		Remaining  amount		Total amount
2 p = 28 u		1 p = 14 u		3 p
13 staplers	5 markers	More staplers	Left
		6	1
13 u	15 u	12 u

Cost of 1 stapler = 1 u
Cost of 1 marker = 3 u

Cost of 13 staplers = 13 x 1 u = 13 u
Cost of 5 markers = 5 x 3 u = 15 u

Cost of 13 staplers + 5 markers
= 13 u + 15 u
= 28 u

2 p = 28 u

1 p = 28 u ÷ 2 = 14 u

Amount of remaining money that Sabrina spent on buying more staplers
= ⁶₇ x 14 u
= 12 u

Number of staplers that Sabrina bought with ⁶₇ of her remaining money
= 12 u ÷ 1 u
= 12

Total number of staplers that Sabrina bought
= 13 + 12
= 25

Answer(s): 25