There were 10 moles of a substance present initially in a system, 5 moles were added to it and a reaction occurred so that its moles are reduced by 20%, what are the final moles of a substance in the system?

There were 10 moles of a substance present initially in a system, 5 moles were added to it and a reaction occurred so that its moles are reduced by 20%, what are the final moles of a substance in the system?

(a) 10

(b) 12

(c) 15

(d) 18

I have been asked this question by my school principal while I was bunking the class.

I want to ask this question from Material Balance Concept topic in portion Introduction to Material Balances of Basic Chemical Engineering

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There were 10 moles of a substance present initially in a system, 5 moles were added to it and a reaction occurred so that its moles are reduced by 20%, what are the final moles of a substance in the system?

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