Sam's age is
23 his brother's age now. 30 years ago, his age was
14 that of his brother's. How old is Sam now?
|
Sam |
Sam's brother |
Difference |
Before |
1x1 = 1 u |
4x1 = 4 u |
3x1 = 3 u |
Change |
+ 30 |
+ 30 |
|
After |
2x3 = 6 u |
3x3 = 9 u |
1x3 = 3 u |
The difference in the age between Sam and Sam's brother remains unchanged. Make the difference in age the same. LCM of 3 and 1 is 3.
Increase in the age of Sam
= 6 u - 1 u
= 5 u
5 u = 30
1 u = 30 ÷ 5 = 6
Sam's age now
= 6 u
= 6 x 6
= 36
Answer(s): 36