When Mr Xavier is 27 years old, his child is 3 years old. In how many years will he be 3 times as old as his child?
| |
Mr Xavier |
His child |
Difference |
| Before |
27 |
3 |
24 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Mr Xavier and his child at first and in the end remains the same.
Difference in the age between Mr Xavier and his child
= 3 u - 1 u
= 2 u
2 u = 27 - 3
2 u = 24
1 u = 24 ÷ 2 = 12
Number of years' time so Mr Xavier will be 3 times as old as his child
= 12 - 3
= 9
Answer(s): 9
