Julie spent
23 of her money on 10 pencils and 9 notebooks. The cost of each notebook is 2 times the cost of each pencil. She bought some more pencils with
67 of her remaining money. How many pencils did Julie buy altogether?
| 10 pencils + 9 notebooks |
Remaining
amount |
Total
amount |
| 2 p = 28 u |
1 p = 14 u |
3 p |
10
pencils |
9
notebooks |
More pencils |
Left |
|
| |
|
6 |
1 |
|
| 10 u |
18 u |
12 u |
|
|
Cost of 1 pencil = 1 u
Cost of 1 notebook = 2 u
Cost of 10 pencils = 10 x 1 u = 10 u
Cost of 9 notebooks = 9 x 2 u = 18 u
Cost of 10 pencils + 9 notebooks
= 10 u + 18 u
= 28 u
2 p = 28 u
1 p = 28 u ÷ 2 = 14 u
Amount of remaining money that Julie spent on buying more pencils
=
67 x 14 u
= 12 u
Number of pencils that Julie bought with
67 of her remaining money
= 12 u ÷ 1 u
= 12
Total number of pencils that Julie bought
= 10 + 12
= 22
Answer(s): 22
