Barbara spent
34 of her money on 12 files and 8 staplers. The cost of each stapler is 3 times the cost of each file. She bought some more files with
34 of her remaining money. How many files did Barbara buy altogether?
| 12 files + 8 staplers |
Remaining
amount |
Total
amount |
| 3 p = 36 u |
1 p = 12 u |
4 p |
12
files |
8
staplers |
More files |
Left |
|
| |
|
3 |
1 |
|
| 12 u |
24 u |
9 u |
|
|
Cost of 1 file = 1 u
Cost of 1 stapler = 3 u
Cost of 12 files = 12 x 1 u = 12 u
Cost of 8 staplers = 8 x 3 u = 24 u
Cost of 12 files + 8 staplers
= 12 u + 24 u
= 36 u
3 p = 36 u
1 p = 36 u ÷ 3 = 12 u
Amount of remaining money that Barbara spent on buying more files
=
34 x 12 u
= 9 u
Number of files that Barbara bought with
34 of her remaining money
= 9 u ÷ 1 u
= 9
Total number of files that Barbara bought
= 12 + 9
= 21
Answer(s): 21
