Penelope spent
37 of her money on 9 pens and 3 staplers. The cost of one stapler was twice the cost of one pen. She bought some more staplers with
15 of her remaining money. How many staplers did Penelope buy altogether?
9 pens and
3 staplers |
Remaining amount |
| 3x5 |
4x5 |
| |
More staplers |
Left |
| |
1x4 |
4x4 |
| 15 p |
4 p |
16 p |
Cost of 1 pen = 1 u
Cost of 1 stapler = 2 u
Cost of 9 pens = 9 x 1 u = 9 u
Cost of 3 staplers = 3 x 2 u = 6 u
Total cost of 9 pens and 3 staplers
= 9 u + 6 u
= 15 u
15 p = 15 u
1 p = 15 ÷ 15 = 1 u
Amount that Penelope used to buy more staplers
= 4 p
= 4 x 1 u
= 4 u
Number of more staplers that Penelope bought
= 4 u ÷ 2 u
= 2
Total number of staplers that Penelope bought
= 3 + 2
= 5
Answer(s): 5
