Mr Glen is 2 times as old as his son, Jack. 24 years ago, the ratio in the age of Mr Glen and Jack was 7 : 2. Find Jack's current age.
| |
Mr Glen |
Jack |
Difference |
| Before |
7x1 =
7 u |
2x1 =
2 u |
5x1 =
5 u |
| Change |
+ 24 |
+ 24 |
|
| After |
2x5 =
10 u |
1x5 =
5 u |
1x5 =
5 u |
The difference in the age of Mr Glen and Jack at first and in the end remains unchanged. Make the difference in age the same. LCM of 5 and 1 is 5.
The increase in the age of Mr Glen and Jack is the same.
Increase in Jack's age
= 5 u - 2 u
= 3 u
3 u = 24
1 u = 24 ÷ 3 = 8
Jack's current age
= 5 u
= 5 x 8
= 40
Answer(s): 40
