The ratio of Warren's age to Mark's age is 9 : 1. Last year, their average age was 14. How old will Mark be in 2 years' time?
| |
Warren |
Mark |
Total |
| Before |
9 u - 1 |
1 u - 1 |
28 |
| Change |
+ 1 |
+ 1 |
|
| After |
9 u |
1 u |
30 |
Total age of Warren and Mark this year
= 9 u + 1 u
= 10 u
Total age of Warren and Mark this year
= 2 x 14 + 1 + 1
= 28 + 2
= 30
10 u = 30
1 u = 30 ÷ 10 = 3
Mark's age in 2 years' time
= 1 u + 2
= 1 x 3 + 2
= 3 + 2
= 5
Answer(s): 5
