Answer: 3/10
Step-by-step explanation: To write the fraction 6/20 in lowest terms, we divide the numerator and the denominator by the greatest common factor of 6 and 20.
Since the factor of 6 are 1, 2, 3, and 6 and the factors of 20 are 1, 2, 4, 5, 10, and 20, the greatest common factor of 6 and 20 is 2.
So we divide the numerator and the denominator of 6/20 by 2 and we get 3/10.
Therefore, 6/20 written in lowest terms is 3/10.