Zane is 5 years old. His father is 30 years older than him. In how many years will Zane's father be 3 times as old as Zane?
| |
His father |
Zane |
Difference |
| Before |
35 |
5 |
30 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Zane and his father at first and in the end remains the same.
Difference in the age between Zane and his father
= 3 u - 1 u
= 2 u
2 u = 30
1 u = 30 ÷ 2 = 15
The increase in age of Zane and his father remains the same.
Number of years' time so Zane's father will be 3 times as old as Zane
= 15 - 5
= 10
Answer(s): 10
