The ratio of Gabriel's age to Ivan's age is 7 : 6. Last year, their average age was 12. How old will Ivan be in 10 years' time?
| |
Gabriel |
Ivan |
Total |
| Before |
7 u - 1 |
6 u - 1 |
24 |
| Change |
+ 1 |
+ 1 |
|
| After |
7 u |
6 u |
26 |
Total age of Gabriel and Ivan this year
= 7 u + 6 u
= 13 u
Total age of Gabriel and Ivan this year
= 2 x 12 + 1 + 1
= 24 + 2
= 26
13 u = 26
1 u = 26 ÷ 13 = 2
Ivan's age in 10 years' time
= 6 u + 10
= 6 x 2 + 10
= 12 + 10
= 22
Answer(s): 22
