The ratio of Glen's age to Jeremy's age is 7 : 2. Next year, their average age will be 19. How old will Glen be in 3 years' time?
| |
Glen |
Jeremy |
Total |
| Before |
7 u |
2 u |
36 |
| Change |
+ 1 |
+ 1 |
|
| After |
7 u + 1 |
2 u + 1 |
38 |
Total age of Glen and Jeremy this year
= 7 u + 2 u
= 9 u
Total age of Glen and Jeremy this year
= 2 x 19 - 1 - 1
= 38 - 2
= 36
9 u = 36
1 u = 36 ÷ 9 = 4
Glen's age in 3 years' time
= 7 u + 3
= 7 x 4 + 3
= 28 + 3
= 31
Answer(s): 31
