Mr Bobby is 2 times as old as his nephew, Brandon. 8 years ago, the ratio in the age of Mr Bobby and Brandon was 8 : 3. Find Mr Bobby's current age.
| |
Mr Bobby |
Brandon |
Difference |
| Before |
8x1 =
8 u |
3x1 =
3 u |
5x1 =
5 u |
| Change |
+ 8 |
+ 8 |
|
| After |
2x5 =
10 u |
1x5 =
5 u |
1x5 =
5 u |
The difference in the age of Mr Bobby and Brandon 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 Bobby and Brandon is the same.
Increase in Brandon's age
= 5 u - 3 u
= 2 u
2 u = 8
1 u = 8 ÷ 2 = 4
Mr Bobby's current age
= 10 u
= 10 x 4
= 40
Answer(s): 40
