Perry's age is
23 his brother's age now. 12 years ago, his age was
25 that of his brother's. How old is Perry now?
|
Perry |
Perry's brother |
Difference |
Before |
2x1 = 2 u |
5x1 = 5 u |
3x1 = 3 u |
Change |
+ 12 |
+ 12 |
|
After |
2x3 = 6 u |
3x3 = 9 u |
1x3 = 3 u |
The difference in the age between Perry and Perry's brother remains unchanged. Make the difference in age the same. LCM of 3 and 1 is 3.
Increase in the age of Perry
= 6 u - 2 u
= 4 u
4 u = 12
1 u = 12 ÷ 4 = 3
Perry's age now
= 6 u
= 6 x 3
= 18
Answer(s): 18