Sarah spent
23 of her money on 14 notebooks and 9 pens. The cost of each pen is 2 times the cost of each notebook. She bought some more notebooks with
34 of her remaining money. How many notebooks did Sarah buy altogether?
| 14 notebooks + 9 pens |
Remaining
amount |
Total
amount |
| 2 p = 32 u |
1 p = 16 u |
3 p |
14
notebooks |
9
pens |
More notebooks |
Left |
|
| |
|
3 |
1 |
|
| 14 u |
18 u |
12 u |
|
|
Cost of 1 notebook = 1 u
Cost of 1 pen = 2 u
Cost of 14 notebooks = 14 x 1 u = 14 u
Cost of 9 pens = 9 x 2 u = 18 u
Cost of 14 notebooks + 9 pens
= 14 u + 18 u
= 32 u
2 p = 32 u
1 p = 32 u ÷ 2 = 16 u
Amount of remaining money that Sarah spent on buying more notebooks
=
34 x 16 u
= 12 u
Number of notebooks that Sarah bought with
34 of her remaining money
= 12 u ÷ 1 u
= 12
Total number of notebooks that Sarah bought
= 14 + 12
= 26
Answer(s): 26
