10kg of a mixture contains 30% sand and 70% clay. In order to make the mixture contain equal quantities of clay and sand how much of the mixture is to be removed and replaced with pure sand?	Options.
A) 10/7 B) 20/7 C) 30/7 D) 40/7 E) 50/7
The mixture contains 3kg sand and 7 kg clay.   For the mixture to be in equal quantities, there should be 2 kg of clay removed.   Clay and sand are in the ratio 7:3   So part of sand to be removed = 2*3/7 = 6/7   So total mixture to be removed = 2 + 6/7 = 20/7   ANSWER:20/7
<result>B</result>
10kg of a mixture contains 30% sand and 70% clay. In order to make the mixture contain equal quantities of clay and sand how much of the mixture is to be removed and replaced with pure sand?