Erika spent
37 of her money on 9 markers and 3 notebooks. The cost of one notebook was twice the cost of one marker. She bought some more notebooks with
15 of her remaining money. How many notebooks did Erika buy altogether?
9 markers and
3 notebooks |
Remaining amount |
| 3x5 |
4x5 |
| |
More notebooks |
Left |
| |
1x4 |
4x4 |
| 15 p |
4 p |
16 p |
Cost of 1 marker = 1 u
Cost of 1 notebook = 2 u
Cost of 9 markers = 9 x 1 u = 9 u
Cost of 3 notebooks = 3 x 2 u = 6 u
Total cost of 9 markers and 3 notebooks
= 9 u + 6 u
= 15 u
15 p = 15 u
1 p = 15 ÷ 15 = 1 u
Amount that Erika used to buy more notebooks
= 4 p
= 4 x 1 u
= 4 u
Number of more notebooks that Erika bought
= 4 u ÷ 2 u
= 2
Total number of notebooks that Erika bought
= 3 + 2
= 5
Answer(s): 5
