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