Yen spent
35 of her money on 6 highlighters and 7 rulers. The cost of one ruler was thrice the cost of one highlighter. She bought some more rulers with
13 of her remaining money. How many rulers did Yen buy altogether?
6 highlighters and
7 rulers |
Remaining amount |
| 3x3 |
2x3 |
| |
More rulers |
Left |
| |
1x2 |
2x2 |
| 9 p |
2 p |
4 p |
Cost of 1 highlighter = 1 u
Cost of 1 ruler = 3 u
Cost of 6 highlighters = 6 x 1 u = 6 u
Cost of 7 rulers = 7 x 3 u = 21 u
Total cost of 6 highlighters and 7 rulers
= 6 u + 21 u
= 27 u
9 p = 27 u
1 p = 27 ÷ 9 = 3 u
Amount that Yen used to buy more rulers
= 2 p
= 2 x 3 u
= 6 u
Number of more rulers that Yen bought
= 6 u ÷ 3 u
= 2
Total number of rulers that Yen bought
= 7 + 2
= 9
Answer(s): 9
