Barbara spent
58 of her money on 10 notebooks and 5 highlighters. The cost of one highlighter was twice the cost of one notebook. She bought some more highlighters with
16 of her remaining money. How many highlighters did Barbara buy altogether?
10 notebooks and
5 highlighters |
Remaining amount |
| 5x2 |
3x2 |
| |
More highlighters |
Left |
| |
1x1 |
5x1 |
| 10 p |
1 p |
5 p |
Cost of 1 notebook = 1 u
Cost of 1 highlighter = 2 u
Cost of 10 notebooks = 10 x 1 u = 10 u
Cost of 5 highlighters = 5 x 2 u = 10 u
Total cost of 10 notebooks and 5 highlighters
= 10 u + 10 u
= 20 u
10 p = 20 u
1 p = 20 ÷ 10 = 2 u
Amount that Barbara used to buy more highlighters
= 1 p
= 1 x 2 u
= 2 u
Number of more highlighters that Barbara bought
= 2 u ÷ 2 u
= 1
Total number of highlighters that Barbara bought
= 5 + 1
= 6
Answer(s): 6
