Question

The wheat sold by a grocer contained 10% low quality wheat. What quantity of good quality weed should be added to 150 g of wheat, so the percentage of bad quality wheat becomes 5%?

• A. 135 g
• B. 150 g
• C. 165 g
• D. 120 g
• E. None of the above

Answer 1

The correct option is B 150 g

Quantity of bad quality wheat $=\frac{10}{100}\times 150=15g$
Amount of wheat required to get a mixture of 5% bad quality wheat $=\frac{15}{5}\times 100=300g$
Amount of wheat that should be added = 150 g