Three girls gave an equal amount of money to buy a present for Bryan. Risa used
13 of her money. Jane used
25 of her money and Winnie used
45 of hers. They had a total of $135 at first. How much was the present?
| |
Risa |
Jane |
Winnie |
Total |
| Before |
3x4 =
12 u |
5x2 =
10 u |
5x1 =
5 u |
27 u ($135) |
| Change |
- 1x4 =
- 4 u |
- 2x2 =
- 4 u |
- 4x1 =
- 4 u |
- 12 u |
| After |
2x4 =
8 u |
3x2 =
6 u |
1x1 =
1 u |
15 u |
The three girls gave equal amount of money to buy the present. Make the amount that each spent the same. LCM of 1, 2 and 4 is 4.
Total amount that three girls had at first
= 12 u + 10 u + 5 u
= 27 u
27 u = 135
1 u = 135 ÷ 27 = 5
Cost of the present
= 3 x 4 u
= 12 u
= 12 x 5
= $60
Answer(s): $60
