Jaslyn spent
34 of her money on 13 pens and 7 notebooks. The cost of each notebook is 2 times the cost of each pen. She bought some more pens with
23 of her remaining money. How many pens did Jaslyn buy altogether?
| 13 pens + 7 notebooks |
Remaining
amount |
Total
amount |
| 3 p = 27 u |
1 p = 9 u |
4 p |
13
pens |
7
notebooks |
More pens |
Left |
|
| |
|
2 |
1 |
|
| 13 u |
14 u |
6 u |
|
|
Cost of 1 pen = 1 u
Cost of 1 notebook = 2 u
Cost of 13 pens = 13 x 1 u = 13 u
Cost of 7 notebooks = 7 x 2 u = 14 u
Cost of 13 pens + 7 notebooks
= 13 u + 14 u
= 27 u
3 p = 27 u
1 p = 27 u ÷ 3 = 9 u
Amount of remaining money that Jaslyn spent on buying more pens
=
23 x 9 u
= 6 u
Number of pens that Jaslyn bought with
23 of her remaining money
= 6 u ÷ 1 u
= 6
Total number of pens that Jaslyn bought
= 13 + 6
= 19
Answer(s): 19
