Ian is 4 years old now. His brother is 40 years older than him. How old will Ian be when his age is
59 of his brother's age?
| |
Ian |
His brother |
Difference |
| Before |
|
|
40 |
| Change |
+ ? |
+ ? |
|
| After |
5 u |
9 u |
4 u |
The difference in the age between Ian and his brother at first and in the end remains unchanged.
Number of years that his brother is older than Ian
= 9 u - 5 u
= 4 u
4 u = 40
1 u = 40 ÷ 4 = 10
Ian's age when his age is
59 of his brother's age
= 5 u
= 5 x 10
= 50
Answer(s): 50
