Zoe spent
23 of her money on 10 staplers and 8 files. The cost of each file is 4 times the cost of each stapler. She bought some more staplers with
67 of her remaining money. How many staplers did Zoe buy altogether?
| 10 staplers + 8 files |
Remaining
amount |
Total
amount |
| 2 p = 42 u |
1 p = 21 u |
3 p |
10
staplers |
8
files |
More staplers |
Left |
|
| |
|
6 |
1 |
|
| 10 u |
32 u |
18 u |
|
|
Cost of 1 stapler = 1 u
Cost of 1 file = 4 u
Cost of 10 staplers = 10 x 1 u = 10 u
Cost of 8 files = 8 x 4 u = 32 u
Cost of 10 staplers + 8 files
= 10 u + 32 u
= 42 u
2 p = 42 u
1 p = 42 u ÷ 2 = 21 u
Amount of remaining money that Zoe spent on buying more staplers
=
67 x 21 u
= 18 u
Number of staplers that Zoe bought with
67 of her remaining money
= 18 u ÷ 1 u
= 18
Total number of staplers that Zoe bought
= 10 + 18
= 28
Answer(s): 28
