Erika and Risa went shopping with a total of $940. After Erika spent
56 of her money and Risa spent $40, the ratio of Risa's money became 4 times as much as Erika's money. Find the ratio of Erika's money to Risa's money at first.
| |
Erika |
Risa |
| Before |
6 u |
4 u + 40 |
| Change |
- 5 u |
- 40 |
| After |
1 u |
|
| Comparing between Erika and Risa in the end |
1 u |
4 u |
Total amount that Erika and Risa had at first
= 6 u + 4 u + 40
= 10 u + 40
10 u + 40 = 940
6 u + 5 u = 940 - 40
10 u = 900
1 u = 900 ÷ 10 = 90
Amount that Erika had at first
= 6 u
= 6 x 90
= $540
Amount that Risa had at first
= 940 - 540
= $400
At first
Erika : Risa
540 : 400
27 : 20
Answer(s): 27 : 20
