Liam is 6 years old. His mother is 20 years older than him. In how many years will Liam's mother be 3 times as old as Liam?
| |
His mother |
Liam |
Difference |
| Before |
26 |
6 |
20 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Liam and his mother at first and in the end remains the same.
Difference in the age between Liam and his mother
= 3 u - 1 u
= 2 u
2 u = 20
1 u = 20 ÷ 2 = 10
The increase in age of Liam and his mother remains the same.
Number of years' time so Liam's mother will be 3 times as old as Liam
= 10 - 6
= 4
Answer(s): 4
