A Mathematical Clue From The Merchant

A rich merchant had collected many gold coins. He did not want anybody to know about them. 

One day, his wife asked, “How many gold coins do we have?”

After pausing a moment, he replied, “Well! If I divide the coins into two unequal numbers, then 32 times the difference between the two numbers equals the difference between the squares of the two numbers.”

The wife looked puzzled. Can you help the merchant’s wife by finding out how many gold coins they have?

Here are mathematical steps to find those!

Using The Mathematical Clue

What was that clue?

Since when divided into 2 unequal numbers difference won't be 0. Let x and y be the 2 unequal numbers.

As per merchant,

32 (x - y) = x^2 - y^2

32 (x - y) = (x - y) (x + y)

Dividing both sides by (x - y) which is non zero as x is not equal to y,

32 = x + y

x + y = 32.

Let's verify with x = 30 and y = 2. So 32 (x - y) = 32 ( 30 - 2) = 896. And x^2 - y^2 = 30^2 - 2^2 = 900 - 4 = 896.

Hence, Merchant had 32 coins in total.

Visual Illusions Psychology

Which monster looking bigger? The one which is chasing the other? Right?

Bigger Vs Smaller

Now look at this. What's your take now?

Equal Heights

Both are of same size. A 3D tunnel built around deceives your visual system & totally changes how it perceive things.

Now take a look at this. Are these straight lines or not? Definitely not! Right?

Straight or Curved

But you are totally wrong! Have a look at this.

Only Straight Lines

Again white & black checks surrounded in certain disorder changes how you perceive things.