Sean's age is
34 his sister's age now. 21 years ago, his age was
25 that of his sister's. How old is Sean now?
|
Sean |
Sean's sister |
Difference |
Before |
2x1 = 2 u |
5x1 = 5 u |
3x1 = 3 u |
Change |
+ 21 |
+ 21 |
|
After |
3x3 = 9 u |
4x3 = 12 u |
1x3 = 3 u |
The difference in the age between Sean and Sean's sister remains unchanged. Make the difference in age the same. LCM of 3 and 1 is 3.
Increase in the age of Sean
= 9 u - 2 u
= 7 u
7 u = 21
1 u = 21 ÷ 7 = 3
Sean's age now
= 9 u
= 9 x 3
= 27
Answer(s): 27