Erika spent
27 of her money on 9 punchers and 5 pencils. The cost of one pencil was thrice the cost of one puncher. She bought some more pencils with
14 of her remaining money. How many pencils did Erika buy altogether?
9 punchers and
5 pencils |
Remaining amount |
| 2x4 |
5x4 |
| |
More pencils |
Left |
| |
1x5 |
3x5 |
| 8 p |
5 p |
15 p |
Cost of 1 puncher = 1 u
Cost of 1 pencil = 3 u
Cost of 9 punchers = 9 x 1 u = 9 u
Cost of 5 pencils = 5 x 3 u = 15 u
Total cost of 9 punchers and 5 pencils
= 9 u + 15 u
= 24 u
8 p = 24 u
1 p = 24 ÷ 8 = 3 u
Amount that Erika used to buy more pencils
= 5 p
= 5 x 3 u
= 15 u
Number of more pencils that Erika bought
= 15 u ÷ 3 u
= 5
Total number of pencils that Erika bought
= 5 + 5
= 10
Answer(s): 10
