Riordan and Reggie had some money at first. Riordan received 3 times as much money as Reggie every month. At the end of 2 months, both of them had the same amount of money. If Reggie had $1280 at first and Riordan had $1720 at the end of those 2 months, what is the ratio of Riordan's money to the total amount of money at first?
| |
Riordan |
Reggie |
| Before |
? |
$1280 |
| Change |
+ 3 u |
+ 1 u |
| After |
$1720 |
$1720 |
Amount that Reggie received every month
= 1720 - 1280
= $440
1 u = 440
Amount that Riordan received every month
= 3 u
= 3 x 440
= $1320
Amount that Riordan had at first
= 1720 - 1320
= $400
Total amount that Riordan and Reggie had at first
= 1280 + 400
= $1680
Riordan's amount : Total amount
400 : 1680
5 : 21
Answer(s): 5 : 21
