Mixture Puzzle

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea. 

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee ?

    

Solution:

Both cups will have same amount.

During swapping,  We took one spoon from tea and mix it with coffee, then again we took one spoon from coffee and mix it with tea. So after mixing both have same quantities. 

Suppose After swapping if 'x' quantity of tea is missing in Tea cup, so that quantity will be in coffee cup. But as both cups have same quantity, then same 'x' quantity will be missing for coffee in coffee cup, and that coffee will be in tea cup.