Yoko spent
45 of her money on 10 files and 6 pens. The cost of each pen is 3 times the cost of each file. She bought some more files with
67 of her remaining money. How many files did Yoko buy altogether?
| 10 files + 6 pens |
Remaining
amount |
Total
amount |
| 4 p = 28 u |
1 p = 7 u |
5 p |
10
files |
6
pens |
More files |
Left |
|
| |
|
6 |
1 |
|
| 10 u |
18 u |
6 u |
|
|
Cost of 1 file = 1 u
Cost of 1 pen = 3 u
Cost of 10 files = 10 x 1 u = 10 u
Cost of 6 pens = 6 x 3 u = 18 u
Cost of 10 files + 6 pens
= 10 u + 18 u
= 28 u
4 p = 28 u
1 p = 28 u ÷ 4 = 7 u
Amount of remaining money that Yoko spent on buying more files
=
67 x 7 u
= 6 u
Number of files that Yoko bought with
67 of her remaining money
= 6 u ÷ 1 u
= 6
Total number of files that Yoko bought
= 10 + 6
= 16
Answer(s): 16
