Mr Tommy is 3 times as old as his nephew, Ryan. 9 years ago, the ratio in the age of Mr Tommy and Ryan was 9 : 2. Find Mr Tommy's current age.
| |
Mr Tommy |
Ryan |
Difference |
| Before |
9x2 =
18 u |
2x2 =
4 u |
7x2 =
14 u |
| Change |
+ 9 |
+ 9 |
|
| After |
3x7 =
21 u |
1x7 =
7 u |
2x7 =
14 u |
The difference in the age of Mr Tommy and Ryan at first and in the end remains unchanged. Make the difference in age the same. LCM of 7 and 2 is 14.
The increase in the age of Mr Tommy and Ryan is the same.
Increase in Ryan's age
= 7 u - 4 u
= 3 u
3 u = 9
1 u = 9 ÷ 3 = 3
Mr Tommy's current age
= 21 u
= 21 x 3
= 63
Answer(s): 63
