Three girls gave an equal amount of money to buy a present for Asher. Roshel used
16 of her money. Erika used
35 of her money and Abi used
45 of hers. They had a total of $749 at first. How much was the present?
|
Roshel |
Erika |
Abi |
Total |
Before |
6x12 = 72 u |
5x4 = 20 u |
5x3 = 15 u |
107 u ($749) |
Change |
- 1x12 = - 12 u |
- 3x4 = - 12 u |
- 4x3 = - 12 u |
- 36 u |
After |
5x12 = 60 u |
2x4 = 8 u |
1x3 = 3 u |
71 u |
The three girls gave equal amount of money to buy the present. Make the amount that each spent the same. LCM of 1, 3 and 4 is 12.
Total amount that three girls had at first
= 72 u + 20 u + 15 u
= 107 u
107 u = 749
1 u = 749 ÷ 107 = 7
Cost of the present
= 3 x 12 u
= 36 u
= 36 x 7
= $252
Answer(s): $252