The ratio of Ivan's age to Jeremy's age is 3 : 2. Next year, their average age will be 21. How old will Ivan be in 10 years' time?
|
Ivan |
Jeremy |
Total |
Before |
3 u |
2 u |
40 |
Change |
+ 1 |
+ 1 |
|
After |
3 u + 1 |
2 u + 1 |
42 |
Total age of Ivan and Jeremy this year
= 3 u + 2 u
= 5 u
Total age of Ivan and Jeremy this year
= 2 x 21 - 1 - 1
= 42 - 2
= 40
5 u = 40
1 u = 40 ÷ 5 = 8
Ivan's age in 10 years' time
= 3 u + 10
= 3 x 8 + 10
= 24 + 10
= 34
Answer(s): 34