Penelope spent
45 of her money on 14 files and 6 staplers. The cost of each stapler is 3 times the cost of each file. She bought some more files with
78 of her remaining money. How many files did Penelope buy altogether?
| 14 files + 6 staplers |
Remaining
amount |
Total
amount |
| 4 p = 32 u |
1 p = 8 u |
5 p |
14
files |
6
staplers |
More files |
Left |
|
| |
|
7 |
1 |
|
| 14 u |
18 u |
7 u |
|
|
Cost of 1 file = 1 u
Cost of 1 stapler = 3 u
Cost of 14 files = 14 x 1 u = 14 u
Cost of 6 staplers = 6 x 3 u = 18 u
Cost of 14 files + 6 staplers
= 14 u + 18 u
= 32 u
4 p = 32 u
1 p = 32 u ÷ 4 = 8 u
Amount of remaining money that Penelope spent on buying more files
=
78 x 8 u
= 7 u
Number of files that Penelope bought with
78 of her remaining money
= 7 u ÷ 1 u
= 7
Total number of files that Penelope bought
= 14 + 7
= 21
Answer(s): 21
