Lucy spent
23 of her money on 12 notebooks and 9 markers. The cost of each marker is 4 times the cost of each notebook. She bought some more notebooks with
23 of her remaining money. How many notebooks did Lucy buy altogether?
| 12 notebooks + 9 markers |
Remaining
amount |
Total
amount |
| 2 p = 48 u |
1 p = 24 u |
3 p |
12
notebooks |
9
markers |
More notebooks |
Left |
|
| |
|
2 |
1 |
|
| 12 u |
36 u |
16 u |
|
|
Cost of 1 notebook = 1 u
Cost of 1 marker = 4 u
Cost of 12 notebooks = 12 x 1 u = 12 u
Cost of 9 markers = 9 x 4 u = 36 u
Cost of 12 notebooks + 9 markers
= 12 u + 36 u
= 48 u
2 p = 48 u
1 p = 48 u ÷ 2 = 24 u
Amount of remaining money that Lucy spent on buying more notebooks
=
23 x 24 u
= 16 u
Number of notebooks that Lucy bought with
23 of her remaining money
= 16 u ÷ 1 u
= 16
Total number of notebooks that Lucy bought
= 12 + 16
= 28
Answer(s): 28
