Betty spent
35 of her money on 10 correction tapes and 4 folders. The cost of one folder was twice the cost of one correction tape. She bought some more folders with
16 of her remaining money. How many folders did Betty buy altogether?
10 correction tapes and
4 folders |
Remaining amount |
| 3x3 |
2x3 |
| |
More folders |
Left |
| |
1x1 |
5x1 |
| 9 p |
1 p |
5 p |
Cost of 1 correction tape = 1 u
Cost of 1 folder = 2 u
Cost of 10 correction tapes = 10 x 1 u = 10 u
Cost of 4 folders = 4 x 2 u = 8 u
Total cost of 10 correction tapes and 4 folders
= 10 u + 8 u
= 18 u
9 p = 18 u
1 p = 18 ÷ 9 = 2 u
Amount that Betty used to buy more folders
= 1 p
= 1 x 2 u
= 2 u
Number of more folders that Betty bought
= 2 u ÷ 2 u
= 1
Total number of folders that Betty bought
= 4 + 1
= 5
Answer(s): 5
