Irene spent
23 of her money on 12 files and 6 pencils. The cost of each pencil is 2 times the cost of each file. She bought some more files with
56 of her remaining money. How many files did Irene buy altogether?
| 12 files + 6 pencils |
Remaining
amount |
Total
amount |
| 2 p = 24 u |
1 p = 12 u |
3 p |
12
files |
6
pencils |
More files |
Left |
|
| |
|
5 |
1 |
|
| 12 u |
12 u |
10 u |
|
|
Cost of 1 file = 1 u
Cost of 1 pencil = 2 u
Cost of 12 files = 12 x 1 u = 12 u
Cost of 6 pencils = 6 x 2 u = 12 u
Cost of 12 files + 6 pencils
= 12 u + 12 u
= 24 u
2 p = 24 u
1 p = 24 u ÷ 2 = 12 u
Amount of remaining money that Irene spent on buying more files
=
56 x 12 u
= 10 u
Number of files that Irene bought with
56 of her remaining money
= 10 u ÷ 1 u
= 10
Total number of files that Irene bought
= 12 + 10
= 22
Answer(s): 22
