Question 16343
"Batman is 20 years older then robin. In 4 years, Batman will be twice Robin age. How old are they now?"
Robin=x
Batman=20+x(Batman older by 20 years )
Very good, you have this correct;
But you do not have the next eqution correct;
Batman will be twice Robin age;
In your equation you have Batmans age;
Batman=2(20+x)
It should be;
2x(Robins age)
Batman is 20 years older then robin,In 4 years,
20+x+4=
Batman will be twice Robin age.
2x
So our equation would be;
20+x+4=2x
x+24=2x
24=2x-x
24=x
So Robins age is 24;
Batmans age;
(24)+20=44
Now check;
20+(24)+4=2(24)
48=48
Hope you see where you went wrong, you were doing a good job though;
=)