Three girls gave an equal amount of money to buy a gift for Lee. Shannon used
13 of her money. Ivory used
35 of her money and Sabrina used
45 of hers. They had a total of $142 at first. How much was the gift?
|
Shannon |
Ivory |
Sabrina |
Total |
Before |
3x12 = 36 u |
5x4 = 20 u |
5x3 = 15 u |
71 u ($142) |
Change |
- 1x12 = - 12 u |
- 3x4 = - 12 u |
- 4x3 = - 12 u |
- 36 u |
After |
2x12 = 24 u |
2x4 = 8 u |
1x3 = 3 u |
35 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 4 is 12.
Total amount that three girls had at first
= 36 u + 20 u + 15 u
= 71 u
71 u = 142
1 u = 142 ÷ 71 = 2
Cost of the gift
= 3 x 12 u
= 36 u
= 36 x 2
= $72
Answer(s): $72