The ratio of Bobby's age to Luis's age is 5 : 1. Next year, their average age will be 22. How old will Bobby be in 6 years' time?
| |
Bobby |
Luis |
Total |
| Before |
5 u |
1 u |
42 |
| Change |
+ 1 |
+ 1 |
|
| After |
5 u + 1 |
1 u + 1 |
44 |
Total age of Bobby and Luis this year
= 5 u + 1 u
= 6 u
Total age of Bobby and Luis this year
= 2 x 22 - 1 - 1
= 44 - 2
= 42
6 u = 42
1 u = 42 ÷ 6 = 7
Bobby's age in 6 years' time
= 5 u + 6
= 5 x 7 + 6
= 35 + 6
= 41
Answer(s): 41
