Nora spent
34 of her money on 10 files and 5 markers. The cost of each marker is 4 times the cost of each file. She bought some more files with
45 of her remaining money. How many files did Nora buy altogether?
| 10 files + 5 markers |
Remaining
amount |
Total
amount |
| 3 p = 30 u |
1 p = 10 u |
4 p |
10
files |
5
markers |
More files |
Left |
|
| |
|
4 |
1 |
|
| 10 u |
20 u |
8 u |
|
|
Cost of 1 file = 1 u
Cost of 1 marker = 4 u
Cost of 10 files = 10 x 1 u = 10 u
Cost of 5 markers = 5 x 4 u = 20 u
Cost of 10 files + 5 markers
= 10 u + 20 u
= 30 u
3 p = 30 u
1 p = 30 u ÷ 3 = 10 u
Amount of remaining money that Nora spent on buying more files
=
45 x 10 u
= 8 u
Number of files that Nora bought with
45 of her remaining money
= 8 u ÷ 1 u
= 8
Total number of files that Nora bought
= 10 + 8
= 18
Answer(s): 18
