Acompany that manufactures cars for freight trains manufactured 226 cars in the month of august, out of which 190 were boxcars. what fraction of the cars manufactured were not boxcars?

First subtract 190 from 226 which will give us 36.  Then you can set up that as a fraction.  You put 226 as the denominator because it's the whole.  You put 36 as the numerator because it is the amount taken out.  36/226.  Now, you can simplify.  The easiest way to simplify is to divide by two until one of them is an odd number. 36/2= 18   226/2= 113   18/113.  Now, because these can't both be divided by two , we must find the lowest common denominator.  There is no common denominator for these two numbers, so the final fraction will be 18/113