A reduction of Rs. 2 per kg enables a man to buy 4 kg more sugar for Rs. 16. Find the original value of sugar (per kg).

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let the orriginal price of sugar be Rs x per kg

quantity purchased is 16/x kg.

after reducing quantity purchased = 16/x - 2kg

 ⇒16/x - 2 = 16/x + 4 

⇒ x = 4

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