Ryan is 8 years old. His mother is 40 years older than him. In how many years will Ryan's mother be 5 times as old as Ryan?
| |
His mother |
Ryan |
Difference |
| Before |
48 |
8 |
40 |
| Change |
+ ? |
+ ? |
|
| After |
5 u |
1 u |
4 u |
The difference in the age between Ryan and his mother at first and in the end remains the same.
Difference in the age between Ryan and his mother
= 5 u - 1 u
= 4 u
4 u = 40
1 u = 40 ÷ 4 = 10
The increase in age of Ryan and his mother remains the same.
Number of years' time so Ryan's mother will be 5 times as old as Ryan
= 10 - 8
= 2
Answer(s): 2
