George's age is
13 his sister's age now. In 15 years' time, his age will be
23 that of his sister's. How old is George now?
| |
George |
George's sister |
Difference |
| Before |
1x1 =
1 u |
3x1 =
3 u |
2x1 =
2 u |
| Change |
+ 15 |
+ 15 |
|
| After |
2x2 =
4 u |
3x2 =
6 u |
1x2 =
2 u |
The difference in the age between George and George's sister remains unchanged. Make the difference in age the same. LCM of 2 and 1 is 2.
Increase in the age of George
= 4 u - 1 u
= 3 u
3 u = 15
1 u = 15 ÷ 3 = 5
George's age now
= 1 u
= 1 x 5
= 5
Answer(s): 5
