Batman is 4 times robins age the sum of their ages equals to 45 how old is batman and robin

Let's say that Batman's age is b, and Robin's age is r.

We can set up a system of equations as such with the given information:



Using substitution, we plug-in 4r from the first equation into b in the second equation to get .

Now, we plug in the value of r into the first equation to get .

Thus, Batman is 36 years old, and Robin is 9 years old... A little weird?