Shiyun spent
27 of her money on 6 markers and 4 pens. The cost of one pen was thrice the cost of one marker. She bought some more pens with
13 of her remaining money. How many pens did Shiyun buy altogether?
6 markers and
4 pens |
Remaining amount |
| 2x3 |
5x3 |
| |
More pens |
Left |
| |
1x5 |
2x5 |
| 6 p |
5 p |
10 p |
Cost of 1 marker = 1 u
Cost of 1 pen = 3 u
Cost of 6 markers = 6 x 1 u = 6 u
Cost of 4 pens = 4 x 3 u = 12 u
Total cost of 6 markers and 4 pens
= 6 u + 12 u
= 18 u
6 p = 18 u
1 p = 18 ÷ 6 = 3 u
Amount that Shiyun used to buy more pens
= 5 p
= 5 x 3 u
= 15 u
Number of more pens that Shiyun bought
= 15 u ÷ 3 u
= 5
Total number of pens that Shiyun bought
= 4 + 5
= 9
Answer(s): 9
