Fred is 3 years old. His mother is 33 years older than him. In how many years will Fred's mother be 4 times as old as Fred?
| |
His mother |
Fred |
Difference |
| Before |
36 |
3 |
33 |
| Change |
+ ? |
+ ? |
|
| After |
4 u |
1 u |
3 u |
The difference in the age between Fred and his mother at first and in the end remains the same.
Difference in the age between Fred and his mother
= 4 u - 1 u
= 3 u
3 u = 33
1 u = 33 ÷ 3 = 11
The increase in age of Fred and his mother remains the same.
Number of years' time so Fred's mother will be 4 times as old as Fred
= 11 - 3
= 8
Answer(s): 8
