Zane's age is
25 his sister's age now. In 42 years' time, his age will be
34 that of his sister's. How old is Zane now?
|
Zane |
Zane's sister |
Difference |
Before |
2x1 = 2 u |
5x1 = 5 u |
3x1 = 3 u |
Change |
+ 42 |
+ 42 |
|
After |
3x3 = 9 u |
4x3 = 12 u |
1x3 = 3 u |
The difference in the age between Zane and Zane's sister remains unchanged. Make the difference in age the same. LCM of 3 and 1 is 3.
Increase in the age of Zane
= 9 u - 2 u
= 7 u
7 u = 42
1 u = 42 ÷ 7 = 6
Zane's age now
= 2 u
= 2 x 6
= 12
Answer(s): 12