Three girls gave an equal amount of money to buy a present for Oscar. Joelle used
15 of her money. Jen used
25 of her money and Esther used
34 of hers. They had a total of $424 at first. How much was the present?
|
Joelle |
Jen |
Esther |
Total |
Before |
5x6 = 30 u |
5x3 = 15 u |
4x2 = 8 u |
53 u ($424) |
Change |
- 1x6 = - 6 u |
- 2x3 = - 6 u |
- 3x2 = - 6 u |
- 18 u |
After |
4x6 = 24 u |
3x3 = 9 u |
1x2 = 2 u |
35 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 3 is 6.
Total amount that three girls had at first
= 30 u + 15 u + 8 u
= 53 u
53 u = 424
1 u = 424 ÷ 53 = 8
Cost of the present
= 3 x 6 u
= 18 u
= 18 x 8
= $144
Answer(s): $144