The ratio of the amount of money that Elyse and Hilda brought along was 4 : 5. For their brother's gift, Elyse and Hilda shared the cost in the ratio of 3 : 2. Elyse used up
35 of her money to pay for her share. After paying for her share, Hilda had $85 left. How much was the gift?
|
Elyse |
Hilda |
Before |
4 u |
5 u |
Change |
- 2.4 u |
- 1.6 u |
Comparing the cost shared between Elyse and Hilda |
- 3 p = - 2.4 u |
- 2 p = - 1.6 u |
After |
1.6 u |
85 |
Amount that Elyse spent on the gift
=
35 x 4 u
= 2.4 u
3 p = 2.4 u
1 p = 2.4 u ÷ 3 = 0.8
2 p = 2 x 0.8 = 1.6 u
Amount that Hilda had left
= 5 u - 1.6 u
= 3.4 u
3.4 u = 85
1 u = 85 ÷ 3.4 = 25
Cost of the gift
= 2.4 u + 1.6 u
= 4 u
= 4 x 25
= $100
Answer: $100