Zeph is 6 years old now. His sister is 16 years older than him. How old will Zeph be when his age is
57 of his sister's age?
| |
Zeph |
His sister |
Difference |
| Before |
|
|
16 |
| Change |
+ ? |
+ ? |
|
| After |
5 u |
7 u |
2 u |
The difference in the age between Zeph and his sister at first and in the end remains unchanged.
Number of years that his sister is older than Zeph
= 7 u - 5 u
= 2 u
2 u = 16
1 u = 16 ÷ 2 = 8
Zeph's age when his age is
57 of his sister's age
= 5 u
= 5 x 8
= 40
Answer(s): 40
