Divide the numerator and denominator by the greatest common divisor (GCD), which is 10 in this case. This gives 11/36 as the answer.
20/360 = 1/18 in its simplest form
140/360 is equivalent to 7/18 in simplest form.
13/60
1/4
90/11
1/2
10/13
2/3
42/360 = 7/60
360/2880 = 1/8
8/360 = 1/45
40 over 360 is equal to 1/9. As a decimal, this recurs, and is 0.1111111111.......