The ratio of Oliver's age to Mark's age is 5 : 1. Next year, their average age will be 16. How old will Oliver be in 10 years' time?
| |
Oliver |
Mark |
Total |
| Before |
5 u |
1 u |
30 |
| Change |
+ 1 |
+ 1 |
|
| After |
5 u + 1 |
1 u + 1 |
32 |
Total age of Oliver and Mark this year
= 5 u + 1 u
= 6 u
Total age of Oliver and Mark this year
= 2 x 16 - 1 - 1
= 32 - 2
= 30
6 u = 30
1 u = 30 ÷ 6 = 5
Oliver's age in 10 years' time
= 5 u + 10
= 5 x 5 + 10
= 25 + 10
= 35
Answer(s): 35
