self Maths Puzzle

A farmer bought 80 kg of potato for Rs 384 and was obliged to sell it at a loss of as much money as he received from selling 16 kg. the selling price kg is

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self Other Question

A reduction of 20 % in the price of mangoes enables a person to purchase 10 more for Rs 160 The cost of the mango before reduction was what is the value of
(x-a)(x-b).......(x-z)