Simon is 9 years old. His mother is 32 years older than him. In how many years will Simon's mother be 3 times as old as Simon?
| |
His mother |
Simon |
Difference |
| Before |
41 |
9 |
32 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Simon and his mother at first and in the end remains the same.
Difference in the age between Simon and his mother
= 3 u - 1 u
= 2 u
2 u = 32
1 u = 32 ÷ 2 = 16
The increase in age of Simon and his mother remains the same.
Number of years' time so Simon's mother will be 3 times as old as Simon
= 16 - 9
= 7
Answer(s): 7
