Eva spent
34 of her money on 12 pens and 6 markers. The cost of each marker is 4 times the cost of each pen. She bought some more pens with
12 of her remaining money. How many pens did Eva buy altogether?
| 12 pens + 6 markers |
Remaining
amount |
Total
amount |
| 3 p = 36 u |
1 p = 12 u |
4 p |
12
pens |
6
markers |
More pens |
Left |
|
| |
|
1 |
1 |
|
| 12 u |
24 u |
6 u |
|
|
Cost of 1 pen = 1 u
Cost of 1 marker = 4 u
Cost of 12 pens = 12 x 1 u = 12 u
Cost of 6 markers = 6 x 4 u = 24 u
Cost of 12 pens + 6 markers
= 12 u + 24 u
= 36 u
3 p = 36 u
1 p = 36 u ÷ 3 = 12 u
Amount of remaining money that Eva spent on buying more pens
=
12 x 12 u
= 6 u
Number of pens that Eva bought with
12 of her remaining money
= 6 u ÷ 1 u
= 6
Total number of pens that Eva bought
= 12 + 6
= 18
Answer(s): 18
