Cathy spent
34 of her money on 10 staplers and 7 files. The cost of each file is 2 times the cost of each stapler. She bought some more staplers with
78 of her remaining money. How many staplers did Cathy buy altogether?
| 10 staplers + 7 files |
Remaining
amount |
Total
amount |
| 3 p = 24 u |
1 p = 8 u |
4 p |
10
staplers |
7
files |
More staplers |
Left |
|
| |
|
7 |
1 |
|
| 10 u |
14 u |
7 u |
|
|
Cost of 1 stapler = 1 u
Cost of 1 file = 2 u
Cost of 10 staplers = 10 x 1 u = 10 u
Cost of 7 files = 7 x 2 u = 14 u
Cost of 10 staplers + 7 files
= 10 u + 14 u
= 24 u
3 p = 24 u
1 p = 24 u ÷ 3 = 8 u
Amount of remaining money that Cathy spent on buying more staplers
=
78 x 8 u
= 7 u
Number of staplers that Cathy bought with
78 of her remaining money
= 7 u ÷ 1 u
= 7
Total number of staplers that Cathy bought
= 10 + 7
= 17
Answer(s): 17
