Xavier is 5 years old now. His brother is 21 years older than him. How old will Xavier be when his age is
47 of his brother's age?
|
Xavier |
His brother |
Difference |
Before |
|
|
21 |
Change |
+ ? |
+ ? |
|
After |
4 u |
7 u |
3 u |
The difference in the age between Xavier and his brother at first and in the end remains unchanged.
Number of years that his brother is older than Xavier
= 7 u - 4 u
= 3 u
3 u = 21
1 u = 21 ÷ 3 = 7
Xavier's age when his age is
47 of his brother's age
= 4 u
= 4 x 7
= 28
Answer(s): 28