Kylie spent
23 of her money on 12 staplers and 9 files. The cost of each file is 4 times the cost of each stapler. She bought some more staplers with
78 of her remaining money. How many staplers did Kylie buy altogether?
| 12 staplers + 9 files |
Remaining
amount |
Total
amount |
| 2 p = 48 u |
1 p = 24 u |
3 p |
12
staplers |
9
files |
More staplers |
Left |
|
| |
|
7 |
1 |
|
| 12 u |
36 u |
21 u |
|
|
Cost of 1 stapler = 1 u
Cost of 1 file = 4 u
Cost of 12 staplers = 12 x 1 u = 12 u
Cost of 9 files = 9 x 4 u = 36 u
Cost of 12 staplers + 9 files
= 12 u + 36 u
= 48 u
2 p = 48 u
1 p = 48 u ÷ 2 = 24 u
Amount of remaining money that Kylie spent on buying more staplers
=
78 x 24 u
= 21 u
Number of staplers that Kylie bought with
78 of her remaining money
= 21 u ÷ 1 u
= 21
Total number of staplers that Kylie bought
= 12 + 21
= 33
Answer(s): 33
