George is 6 years older than Billy. 12 years ago, the sum of their age was 58. How old is Billy now?
| |
George |
Billy |
Difference |
Total |
| Before |
1 u + 6 |
1 u |
6 |
58 |
| Change |
+ 12 |
+ 12 |
|
+ 24 |
| After |
1 u + 18 |
1 u + 12 |
6 |
2 u + 30 |
The difference in the age between George and Billy remains unchanged.
Billy's current age = 1 u
George's current age = 1 u + 6
Combined age of George and Johny 12 years ago
= 1 u + 1 u + 6
= 2 u + 6
2 u + 6 = 58
2 u = 58 - 6
2 u = 52
1 u = 52 ÷ 2 = 26
Billy's current age
= 1 u + 12
= 26 + 12
= 38
Answer(s): 38
