Sarah spent
35 of her money on 3 post-it pads and 6 folders. The cost of one folder was twice the cost of one post-it pad. She bought some more folders with
15 of her remaining money. How many folders did Sarah buy altogether?
3 post-it pads and
6 folders |
Remaining amount |
| 3x5 |
2x5 |
| |
More folders |
Left |
| |
1x2 |
4x2 |
| 15 p |
2 p |
8 p |
Cost of 1 post-it pad = 1 u
Cost of 1 folder = 2 u
Cost of 3 post-it pads = 3 x 1 u = 3 u
Cost of 6 folders = 6 x 2 u = 12 u
Total cost of 3 post-it pads and 6 folders
= 3 u + 12 u
= 15 u
15 p = 15 u
1 p = 15 ÷ 15 = 1 u
Amount that Sarah used to buy more folders
= 2 p
= 2 x 1 u
= 2 u
Number of more folders that Sarah bought
= 2 u ÷ 2 u
= 1
Total number of folders that Sarah bought
= 6 + 1
= 7
Answer(s): 7
