Gem spent
34 of her money on 11 pens and 5 notebooks. The cost of each notebook is 2 times the cost of each pen. She bought some more pens with
67 of her remaining money. How many pens did Gem buy altogether?
| 11 pens + 5 notebooks |
Remaining
amount |
Total
amount |
| 3 p = 21 u |
1 p = 7 u |
4 p |
11
pens |
5
notebooks |
More pens |
Left |
|
| |
|
6 |
1 |
|
| 11 u |
10 u |
6 u |
|
|
Cost of 1 pen = 1 u
Cost of 1 notebook = 2 u
Cost of 11 pens = 11 x 1 u = 11 u
Cost of 5 notebooks = 5 x 2 u = 10 u
Cost of 11 pens + 5 notebooks
= 11 u + 10 u
= 21 u
3 p = 21 u
1 p = 21 u ÷ 3 = 7 u
Amount of remaining money that Gem spent on buying more pens
=
67 x 7 u
= 6 u
Number of pens that Gem bought with
67 of her remaining money
= 6 u ÷ 1 u
= 6
Total number of pens that Gem bought
= 11 + 6
= 17
Answer(s): 17
