The age of Vincent is
45 of Seth's age. 21 years ago, the ratio of Vincent's age to Seth's age was 5 : 8. How old is Seth now?
| |
Vincent |
Seth |
Difference |
| Before |
5 u |
8 u |
3 u |
| Change |
+ 21 |
+ 21 |
|
| After |
4x3 =
12 u |
5x3 =
15 u |
1x3 =
3 u |
The difference in the age between Vincent and Seth at first and in the end remains unchanged. Make the difference in the age between Vincent and Seth the same. LCM of 3 and 1 is 3.
Increase in Vincent's age
= 12 u - 5 u
= 7 u
7 u = 21
1 u = 21 ÷ 7 = 3
Seth's age now
= 15 u
= 15 x 3
= 45
Answer(s): 45
