Min spent
45 of her money on 13 staplers and 5 files. The cost of each file is 3 times the cost of each stapler. She bought some more staplers with
67 of her remaining money. How many staplers did Min buy altogether?
| 13 staplers + 5 files |
Remaining
amount |
Total
amount |
| 4 p = 28 u |
1 p = 7 u |
5 p |
13
staplers |
5
files |
More staplers |
Left |
|
| |
|
6 |
1 |
|
| 13 u |
15 u |
6 u |
|
|
Cost of 1 stapler = 1 u
Cost of 1 file = 3 u
Cost of 13 staplers = 13 x 1 u = 13 u
Cost of 5 files = 5 x 3 u = 15 u
Cost of 13 staplers + 5 files
= 13 u + 15 u
= 28 u
4 p = 28 u
1 p = 28 u ÷ 4 = 7 u
Amount of remaining money that Min spent on buying more staplers
=
67 x 7 u
= 6 u
Number of staplers that Min bought with
67 of her remaining money
= 6 u ÷ 1 u
= 6
Total number of staplers that Min bought
= 13 + 6
= 19
Answer(s): 19
