The ratio of Bobby's age to Liam's age is 2 : 1. Last year, their average age was 17. How old will Liam be in 2 years' time?
| |
Bobby |
Liam |
Total |
| Before |
2 u - 1 |
1 u - 1 |
34 |
| Change |
+ 1 |
+ 1 |
|
| After |
2 u |
1 u |
36 |
Total age of Bobby and Liam this year
= 2 u + 1 u
= 3 u
Total age of Bobby and Liam this year
= 2 x 17 + 1 + 1
= 34 + 2
= 36
3 u = 36
1 u = 36 ÷ 3 = 12
Liam's age in 2 years' time
= 1 u + 2
= 1 x 12 + 2
= 12 + 2
= 14
Answer(s): 14
