The age of Riordan is
58 of Daniel's age. 28 years later, the ratio of Riordan's age to Daniel's age is 4 : 5. How old is Daniel at first?
| |
Riordan |
Daniel |
Difference |
| Before |
5 u |
8 u |
3 u |
| Change |
+ 28 |
+ 28 |
|
| After |
4x3 =
12 u |
5x3 =
15 u |
1x3 =
3 u |
The difference in the age between Riordan and Daniel at first and in the end remains unchanged. Make the difference in the age between Riordan and Daniel the same. LCM of 3 and 1 is 3.
Increase in Riordan's age
= 12 u - 5 u
= 7 u
7 u = 28
1 u = 28 ÷ 7 = 4
Daniel's age at first
= 8 u
= 8 x 4
= 32
Answer(s): 32
