The ratio of Sam's age to Valen's age is 8 : 3. Last year, their average age was 21. How old will Valen be in 2 years' time?
| |
Sam |
Valen |
Total |
| Before |
8 u - 1 |
3 u - 1 |
42 |
| Change |
+ 1 |
+ 1 |
|
| After |
8 u |
3 u |
44 |
Total age of Sam and Valen this year
= 8 u + 3 u
= 11 u
Total age of Sam and Valen this year
= 2 x 21 + 1 + 1
= 42 + 2
= 44
11 u = 44
1 u = 44 ÷ 11 = 4
Valen's age in 2 years' time
= 3 u + 2
= 3 x 4 + 2
= 12 + 2
= 14
Answer(s): 14
