Cindy spent
23 of her money on 12 files and 9 markers. The cost of each marker is 2 times the cost of each file. She bought some more files with
45 of her remaining money. How many files did Cindy buy altogether?
| 12 files + 9 markers |
Remaining
amount |
Total
amount |
| 2 p = 30 u |
1 p = 15 u |
3 p |
12
files |
9
markers |
More files |
Left |
|
| |
|
4 |
1 |
|
| 12 u |
18 u |
12 u |
|
|
Cost of 1 file = 1 u
Cost of 1 marker = 2 u
Cost of 12 files = 12 x 1 u = 12 u
Cost of 9 markers = 9 x 2 u = 18 u
Cost of 12 files + 9 markers
= 12 u + 18 u
= 30 u
2 p = 30 u
1 p = 30 u ÷ 2 = 15 u
Amount of remaining money that Cindy spent on buying more files
=
45 x 15 u
= 12 u
Number of files that Cindy bought with
45 of her remaining money
= 12 u ÷ 1 u
= 12
Total number of files that Cindy bought
= 12 + 12
= 24
Answer(s): 24
