Barbara spent
34 of her money on 14 notebooks and 5 files. The cost of each file is 2 times the cost of each notebook. She bought some more notebooks with
78 of her remaining money. How many notebooks did Barbara buy altogether?
| 14 notebooks + 5 files |
Remaining
amount |
Total
amount |
| 3 p = 24 u |
1 p = 8 u |
4 p |
14
notebooks |
5
files |
More notebooks |
Left |
|
| |
|
7 |
1 |
|
| 14 u |
10 u |
7 u |
|
|
Cost of 1 notebook = 1 u
Cost of 1 file = 2 u
Cost of 14 notebooks = 14 x 1 u = 14 u
Cost of 5 files = 5 x 2 u = 10 u
Cost of 14 notebooks + 5 files
= 14 u + 10 u
= 24 u
3 p = 24 u
1 p = 24 u ÷ 3 = 8 u
Amount of remaining money that Barbara spent on buying more notebooks
=
78 x 8 u
= 7 u
Number of notebooks that Barbara bought with
78 of her remaining money
= 7 u ÷ 1 u
= 7
Total number of notebooks that Barbara bought
= 14 + 7
= 21
Answer(s): 21
