Question

There are two cups, one containing orange juice and one containing an equal amount of lemonade. One teaspoon of the orange juice is taken and mixed with the lemonade. Then a teaspoon of this mixture is mixed back into the orange juice. Is there more lemonade in the orange juice or more orange juice in the lemonade?

• A. More orange juice in the lemonade
• B. More lemonade in the orange juice
• C. Equal amount of each juice between the two cups
• D. None of the above

Hint:

Since both cups end up holding the same total volume they started with, whatever lemonade is missing from its own cup has to be sitting in the orange juice, in exactly the same amount as the orange juice missing from its cup.

Answer 1

The Correct Option is C

Since both cups return to their original volume V after the two transfers, whatever lemonade is missing from the lemonade cup must be exactly replaced by orange juice, and vice versa - the two cross-contaminations are always equal.

Final Answer: Equal amounts, option (3).