Bobby is 9 years older than Charlie. 9 years ago, the sum of their age was 59. How old is Bobby now?
| |
Bobby |
Charlie |
Difference |
Total |
| Before |
1 u + 9 |
1 u |
9 |
59 |
| Change |
+ 9 |
+ 9 |
|
+ 18 |
| After |
1 u + 18 |
1 u + 9 |
9 |
2 u + 27 |
The difference in the age between Bobby and Charlie remains unchanged.
Charlie's current age = 1 u
Bobby's current age = 1 u + 9
Combined age of Bobby and Johny 9 years ago
= 1 u + 1 u + 9
= 2 u + 9
2 u + 9 = 59
2 u = 59 - 9
2 u = 50
1 u = 50 ÷ 2 = 25
Bobby's current age
= 1 u + 18
= 25 + 18
= 43
Answer(s): 43
