'Yes, that makes perfect sense. I understood the concept of negative numbers', said Shubhlin as other mathematicians nodded in agreement. Then you asked one more question, 'If you have understood the concepts, tell me if you have -5 gold coins and you earn 15 more gold coins. How many gold coins you have now, mathematically?

At this Shubhlin started thinking and told: I will have-

20 coins

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-20 coins

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10 coins

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-10 coins

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Solution

The correct option is C
10 coins

If Shubhlin earned 15 more gold coins, the coins with him now can be represented as: (-5 + 15) coins.

Let us think practically. He had to give 5 gold coins to somebody he had taken them from before. So, from 15 gold coins earned, 5 will clear the debt. Now, he would have 10 coins of his own. So, it can be represented as 10 gold coins.

So, (-5 + 15) = 10.

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Similar questions

Then Shubhlin told, 'Look, I had told before! There had to be an answer to my question. But why do we need the negative numbers?' Once again you were being stared upon by a lot of curious eyes. After looking at old shoe (with a hole atop) of Shubhlin, you replied: Suppose you have 4 gold coins. In mathematical terms I can say that you have +4 coins. After you spent 2 gold coins for food and 2 gold coins for clothes, you want a shoe. So, you borrowed 5 gold coins from somebody. Now if I make the same statement that you have +5 coins, is it true or false?

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'Yes, that is right. Who told the answer??' you asked. When the dwarf who answered the question came forward, everybody gasped with surprise except the fellow mathematicians who became even angrier. When you asked his name, he told that his name was Shubhlin. He was the one who asked that question. Then you told, 'I am from India. The digit 0 was invented by the great Aryabhata in my country. Whole numbers are not the only numbers there. The question asked by Shubhlin does make sense. We have already found the answer to those questions.'

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Now, everybody seemed to be happy with your proposed solution except one dwarf. He stood and then asked, 'I have understood everything but why have you given '0' a different colour?' You were about to answer to his question when Shubhlin stopped you and told: I will answer your question sir. '0' is coloured differently because it is-

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