Answer
3/10
Work Step by Step
In order to simplify a fraction, we first need to find the greatest common factor for the number in the numerator and the number in the denominator. Then, we divide both the numerator and the denominator by this number to get the simplified form of the fraction. The greatest common factor of 40 and 12 is 4, so we divide the fraction by 4/4 to get the simplified form: 3/10.