When Mr Glen is 32 years old, his niece is 8 years old. In how many years will he be 3 times as old as his niece?
|
Mr Glen |
His niece |
Difference |
Before |
32 |
8 |
24 |
Change |
+ ? |
+ ? |
|
After |
3 u |
1 u |
2 u |
The difference in the age between Mr Glen and his niece at first and in the end remains the same.
Difference in the age between Mr Glen and his niece
= 3 u - 1 u
= 2 u
2 u = 32 - 8
2 u = 24
1 u = 24 ÷ 2 = 12
Number of years' time so Mr Glen will be 3 times as old as his niece
= 12 - 8
= 4
Answer(s): 4