Simon is 4 years old now. His sister is 16 years older than him. How old will Simon be when his age is
59 of his sister's age?
| |
Simon |
His sister |
Difference |
| Before |
|
|
16 |
| Change |
+ ? |
+ ? |
|
| After |
5 u |
9 u |
4 u |
The difference in the age between Simon and his sister at first and in the end remains unchanged.
Number of years that his sister is older than Simon
= 9 u - 5 u
= 4 u
4 u = 16
1 u = 16 ÷ 4 = 4
Simon's age when his age is
59 of his sister's age
= 5 u
= 5 x 4
= 20
Answer(s): 20
