Irene spent
35 of her money on 4 post-it pads and 7 files. The cost of one file was twice the cost of one post-it pad. She bought some more files with
16 of her remaining money. How many files did Irene buy altogether?
4 post-it pads and
7 files |
Remaining amount |
| 3x3 |
2x3 |
| |
More files |
Left |
| |
1x1 |
5x1 |
| 9 p |
1 p |
5 p |
Cost of 1 post-it pad = 1 u
Cost of 1 file = 2 u
Cost of 4 post-it pads = 4 x 1 u = 4 u
Cost of 7 files = 7 x 2 u = 14 u
Total cost of 4 post-it pads and 7 files
= 4 u + 14 u
= 18 u
9 p = 18 u
1 p = 18 ÷ 9 = 2 u
Amount that Irene used to buy more files
= 1 p
= 1 x 2 u
= 2 u
Number of more files that Irene bought
= 2 u ÷ 2 u
= 1
Total number of files that Irene bought
= 7 + 1
= 8
Answer(s): 8
