Luis is 7 years old now. His brother is 25 years older than him. How old will Luis be when his age is
49 of his brother's age?
| |
Luis |
His brother |
Difference |
| Before |
|
|
25 |
| Change |
+ ? |
+ ? |
|
| After |
4 u |
9 u |
5 u |
The difference in the age between Luis and his brother at first and in the end remains unchanged.
Number of years that his brother is older than Luis
= 9 u - 4 u
= 5 u
5 u = 25
1 u = 25 ÷ 5 = 5
Luis's age when his age is
49 of his brother's age
= 4 u
= 4 x 5
= 20
Answer(s): 20
