Tom's age is
25 his sister's age now. In 28 years' time, his age will be
34 that of his sister's. How old is Tom now?
| |
Tom |
Tom's sister |
Difference |
| Before |
2x1 =
2 u |
5x1 =
5 u |
3x1 =
3 u |
| Change |
+ 28 |
+ 28 |
|
| After |
3x3 =
9 u |
4x3 =
12 u |
1x3 =
3 u |
The difference in the age between Tom and Tom's sister remains unchanged. Make the difference in age the same. LCM of 3 and 1 is 3.
Increase in the age of Tom
= 9 u - 2 u
= 7 u
7 u = 28
1 u = 28 ÷ 7 = 4
Tom's age now
= 2 u
= 2 x 4
= 8
Answer(s): 8
