20/1 + 1/3 = 20 1/3
However, I think you mean 'add one third of rwenty , to twenty'.
Hence
20+(20 x 1/3) = 20 + 6.666.... = 26.6666.... or 26 2/3
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1/6 plus 1/5 plus 1/4 plus 1/3 plus 1/2 = 1 9/20 or 1.45
this is clearly a trick question. 20 plus 20 plus 20 is equal to 60 and there is 60 minites in 1 whole hour so 20 plus 20 plus 20 is equal to 1.
8 tenths plus 1 third = 9
109 you can plus like this: (19+1)+20+20+(1+1+18)+4+25
The sum is 1. 1/3 + 1/3 + 1/3 = 3/3 = 1