SOLUTION: 150Kg of wheat contained 10% of low quality wheat. What quantity of good quality wheat should be added so that the percentage of low quality wheat becomes 5% ?

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Question 980101: 150Kg of wheat contained 10% of low quality wheat. What quantity of good quality wheat should be added so that the percentage of low quality wheat becomes 5% ?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
150 kilograms, without much thinking. Think about the situation and you should understand intuitively. This may guide you in trying to do it using algebra.

Changing from 10% to 5% means cutting the concentration in half.