Oscar is 9 years old. His mother is 26 years older than him. In how many years will Oscar's mother be 3 times as old as Oscar?
| |
His mother |
Oscar |
Difference |
| Before |
35 |
9 |
26 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Oscar and his mother at first and in the end remains the same.
Difference in the age between Oscar and his mother
= 3 u - 1 u
= 2 u
2 u = 26
1 u = 26 ÷ 2 = 13
The increase in age of Oscar and his mother remains the same.
Number of years' time so Oscar's mother will be 3 times as old as Oscar
= 13 - 9
= 4
Answer(s): 4
