Question
A trader has 1800 kg of wheat. A part of it is sold at
18% profit, and the remaining at 10% profit. If the overall profit earned on the whole quantity is 14%, find the quantity (in kg) sold at 10% profit.Solution
Let the quantity of wheat sold at 18% profit be x kg.
Then, the quantity sold at 10% profit = 1800 - x kg. 
Thus, the quantity of wheat sold at 10% profit = 1800 - 900 = 900 kg.
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