Suppose we lay down** two cup**s 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** ?
**Skip to the answer! **
**How mixture made?**
**A**fter adding 1 spoon of **tea** into **coffee,** the levels of liquids in both cups must be** unequal.** Whatever now tea cup is missing is now in cup of coffee & mixed with coffee. The content of tea in the cup of coffee is certainly more.
Now after **taking** spoonful of the** mixture back to tea** cup the levels of the liquid in both cups would be same. Hence, whatever the** cup of tea** is** missing** is replaced by** coffee.** That** missing tea content** is now in the **cup of coffee** where it has replaced **some of coffee **content!

Suppose there are **100****0 molecules **in each cup i.e. of tea & coffee. Let's assume **100** molecules of tea are mixed to coffee using spoon. Now, coffee cup will have **1100** molecules and tea will have **900** molecules. Obviously, right now the cup of coffee contains **more** tea (100 molecules) that coffee in cup of tea (0 molecules)!
Now while taking 100 molecules back from mixture having 1100 molecules, suppose** 70** molecules of coffee & **30** of tea are taken. That means, exactly 100 - 30 = 70 molecules of tea left in mixture. That 70 + 30 molecules mixture is poured into cup of tea. That is exact 70 molecules of coffee mixed in tea.
What does it mean? **70** molecules of **coffee** have displaced **70** molecules of **tea** into cup of **coffee** maintaining level of both the liquids.
We can say other way as well. **30** molecules of **tea** displaced **30** molecules of coffee into cup of **tea** while maintaining levels of both the liquids same.
So the answer is both have **same** level of contents mixed.
** **
One day, a **class teacher** was told that the school **superintendent **will be
visiting her class on the next day. The superintendent can ask
questions from anywhere and it can be easy as well as difficult. The
teacher will have the **liberty** to **choose** any **pupil** for answering the
question.

Now she is **determined** that the** impression** that is cast upon the
superintendent after the inspection should be **great.** How will she **
instruct** the students so that she **maximizes **the **chances** of receiving a
**correct** answer for each question? Also, she must create the **best**
impression. How will she do it?
**This is what she should do! **
**What was the resolution of teacher?**
Now what should teacher do here is to devise the **'sign'** language to communicate with students. Also she needs to make sure that the superintendent won't have any doubt while questioning students.
She should ask all the students to** raise hands** for **every question** that is being asked by superintendent. However, those who know **correct answers** should raise** right hand** & rest of all should raise** left hand.** This way she would be able to **know the students** who knows the correct answer & **choose** any of them to answer the question.
All raised hands to each question would definitely leave** great **impression on the superintendent.
Note : We are assuming **superintendent not smart** enough to notice that students raising different hands for different questions.