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
3 over 20
20/30 = (2 x 10)/(3 x 10) = 2/3
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.
It is: 2/3 times 20/12 = 10/9 in its simplest form
2/5 + 3/4 - 1/2 equals 8/20 + 15/20 - 10/20 which adds up to 8/20 This equals 4/5
14/20 - 3/5 = 14/20 - 12/20 = 2/20 = 1/10