Three girls gave an equal amount of money to buy a gift for Tom. Cathy used
16 of her money. Gabby used
34 of her money and Roshel used
23 of hers. They had a total of $424 at first. How much was the gift?
|
Cathy |
Gabby |
Roshel |
Total |
Before |
6x6 = 36 u |
4x2 = 8 u |
3x3 = 9 u |
$424 |
Change |
- 1x6 = - 6 u |
- 3x2 = - 6 u |
- 2x3 = - 6 u |
- 18 u |
After |
5x6 = 30 u |
1x2 = 2 u |
1x3 = 3 u |
u |
The three girls gave equal amount of money to buy the gift. Make the amount that each spent the same. LCM of 1, 3 and 2 is 6.
Total amount that three girls had at first
= 36 u + 8 u + 9 u
= 53 u
53 u = 424
1 u = 424 ÷ 53 = 8
Cost of the gift
= 3 x 6 u
= 18 u
= 18 x 8
= $144
Answer(s): $144