Jack is 3 years old now. His brother is 36 years older than him. How old will Jack be when his age is
47 of his brother's age?
| |
Jack |
His brother |
Difference |
| Before |
|
|
36 |
| Change |
+ ? |
+ ? |
|
| After |
4 u |
7 u |
3 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
= 7 u - 4 u
= 3 u
3 u = 36
1 u = 36 ÷ 3 = 12
Jack's age when his age is
47 of his brother's age
= 4 u
= 4 x 12
= 48
Answer(s): 48
