Ken is 2 years old. His mother is 33 years older than him. In how many years will Ken's mother be 4 times as old as Ken?
| |
His mother |
Ken |
Difference |
| Before |
35 |
2 |
33 |
| Change |
+ ? |
+ ? |
|
| After |
4 u |
1 u |
3 u |
The difference in the age between Ken and his mother at first and in the end remains the same.
Difference in the age between Ken and his mother
= 4 u - 1 u
= 3 u
3 u = 33
1 u = 33 ÷ 3 = 11
The increase in age of Ken and his mother remains the same.
Number of years' time so Ken's mother will be 4 times as old as Ken
= 11 - 2
= 9
Answer(s): 9
