11/20
2/20 + 1/20 = 3/20
(20/21)/(2/3) = (20/21) x (3/2) = 10/7 = 1 and 3/7 = 1.428571429
No. 2/5 with the denominator of 20 would be 8/20.
2 over 3
2 3 over 20
11/20
2*3=6 5*4=20 answer is 6/20
3 over 20
20/30 = (2 x 10)/(3 x 10) = 2/3
2/5 - 3/4 = 8/20 - 15/20 = -7/20 (negative 7/20)
3/4 and 20/30 does not make a proportion. 20/30 = 2/3 3/4 does not equal 2/3 so it is not a proportion.
2/3