Jack is 4 years old now. His brother is 30 years older than him. How old will Jack be when his age is
49 of his brother's age?
| |
Jack |
His brother |
Difference |
| Before |
|
|
30 |
| Change |
+ ? |
+ ? |
|
| After |
4 u |
9 u |
5 u |
The difference in the age between Jack and his brother at first and in the end remains unchanged.
Number of years that his brother is older than Jack
= 9 u - 4 u
= 5 u
5 u = 30
1 u = 30 ÷ 5 = 6
Jack's age when his age is
49 of his brother's age
= 4 u
= 4 x 6
= 24
Answer(s): 24
