Irene spent
27 of her money on 6 glues and 10 pens. The cost of one pen was thrice the cost of one glue. She bought some more pens with
16 of her remaining money. How many pens did Irene buy altogether?
6 glues and
10 pens |
Remaining amount |
| 2x6 |
5x6 |
| |
More pens |
Left |
| |
1x5 |
5x5 |
| 12 p |
5 p |
25 p |
Cost of 1 glue = 1 u
Cost of 1 pen = 3 u
Cost of 6 glues = 6 x 1 u = 6 u
Cost of 10 pens = 10 x 3 u = 30 u
Total cost of 6 glues and 10 pens
= 6 u + 30 u
= 36 u
12 p = 36 u
1 p = 36 ÷ 12 = 3 u
Amount that Irene used to buy more pens
= 5 p
= 5 x 3 u
= 15 u
Number of more pens that Irene bought
= 15 u ÷ 3 u
= 5
Total number of pens that Irene bought
= 10 + 5
= 15
Answer(s): 15
