Albert is 2 years old. His uncle is 45 years older than him. In how many years will Albert's uncle be 4 times as old as Albert?
| |
His uncle |
Albert |
Difference |
| Before |
47 |
2 |
45 |
| Change |
+ ? |
+ ? |
|
| After |
4 u |
1 u |
3 u |
The difference in the age between Albert and his uncle at first and in the end remains the same.
Difference in the age between Albert and his uncle
= 4 u - 1 u
= 3 u
3 u = 45
1 u = 45 ÷ 3 = 15
The increase in age of Albert and his uncle remains the same.
Number of years' time so Albert's uncle will be 4 times as old as Albert
= 15 - 2
= 13
Answer(s): 13
