Mr Ahmad is 2 times as old as his son, David. 6 years ago, the ratio in the age of Mr Ahmad and David was 8 : 3. Find David's current age.
| |
Mr Ahmad |
David |
Difference |
| Before |
8x1 =
8 u |
3x1 =
3 u |
5x1 =
5 u |
| Change |
+ 6 |
+ 6 |
|
| After |
2x5 =
10 u |
1x5 =
5 u |
1x5 =
5 u |
The difference in the age of Mr Ahmad and David 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 Ahmad and David is the same.
Increase in David's age
= 5 u - 3 u
= 2 u
2 u = 6
1 u = 6 ÷ 2 = 3
David's current age
= 5 u
= 5 x 3
= 15
Answer(s): 15
