Riordan and Eric had some money at first. Riordan received 3 times as much money as Eric every month. At the end of 4 months, both of them had the same amount of money. If Eric had $1280 at first and Riordan had $1880 at the end of those 4 months, what is the ratio of Riordan's money to the total amount of money at first?
| |
Riordan |
Eric |
| Before |
? |
$1280 |
| Change |
+ 3 u |
+ 1 u |
| After |
$1880 |
$1880 |
Amount that Eric received every month
= 1880 - 1280
= $600
1 u = 600
Amount that Riordan received every month
= 3 u
= 3 x 600
= $1800
Amount that Riordan had at first
= 1880 - 1800
= $80
Total amount that Riordan and Eric had at first
= 1280 + 80
= $1360
Riordan's amount : Total amount
80 : 1360
1 : 17
Answer(s): 1 : 17
