Fred is 3 years old now. His brother is 18 years older than him. How old will Fred be when his age is
47 of his brother's age?
| |
Fred |
His brother |
Difference |
| Before |
|
|
18 |
| Change |
+ ? |
+ ? |
|
| After |
4 u |
7 u |
3 u |
The difference in the age between Fred and his brother at first and in the end remains unchanged.
Number of years that his brother is older than Fred
= 7 u - 4 u
= 3 u
3 u = 18
1 u = 18 ÷ 3 = 6
Fred's age when his age is
47 of his brother's age
= 4 u
= 4 x 6
= 24
Answer(s): 24
