Question

1/2 spoon of sugar for 2 cups , how many cups for 2/3 sugar of spoon? Explain

Answer 1

If you have
1/2 sugar...........................................2 cups  and 
2/3 sugar.............................................?

this is a proportion, and we can write it as
#cups= (2/3)*2  = (4/3)=  (4/3)*(2/1)=8/3= 2  2/3 cups
                 1/2        1/2

Answer 2

1/2 spoon for 2 cups.
1 spoon for 4 cups. 
2/3 spoon for 8/3 cups.