Sean is 7 years older than Jack. 8 years ago, the sum of their age was 61. How old is Sean now?
| |
Sean |
Jack |
Difference |
Total |
| Before |
1 u + 7 |
1 u |
7 |
61 |
| Change |
+ 8 |
+ 8 |
|
+ 16 |
| After |
1 u + 15 |
1 u + 8 |
7 |
2 u + 23 |
The difference in the age between Sean and Jack remains unchanged.
Jack's current age = 1 u
Sean's current age = 1 u + 7
Combined age of Sean and Johny 8 years ago
= 1 u + 1 u + 7
= 2 u + 7
2 u + 7 = 61
2 u = 61 - 7
2 u = 54
1 u = 54 ÷ 2 = 27
Sean's current age
= 1 u + 15
= 27 + 15
= 42
Answer(s): 42
