The ratio of Elijah's age to Michael's age is 4 : 1. Next year, their average age will be 11. How old will Elijah be in 3 years' time?
| |
Elijah |
Michael |
Total |
| Before |
4 u |
1 u |
20 |
| Change |
+ 1 |
+ 1 |
|
| After |
4 u + 1 |
1 u + 1 |
22 |
Total age of Elijah and Michael this year
= 4 u + 1 u
= 5 u
Total age of Elijah and Michael this year
= 2 x 11 - 1 - 1
= 22 - 2
= 20
5 u = 20
1 u = 20 ÷ 5 = 4
Elijah's age in 3 years' time
= 4 u + 3
= 4 x 4 + 3
= 16 + 3
= 19
Answer(s): 19
