How many kg of pure salt must be added to 100kg of 10% solution of salt and water to increase it to a 25% solution?
Choose the correct choice from the following choices.
A) A)6.7  B) B)1.3  C) C)9.6  D) D)20  E) E)7.9
Amount salt in 100kg solution = 10*100/100= 
<gadget id="calculator">10*100/100</gadget>
<output>10</output>
10 kg   Let x kg of pure salt be added   then(10+x)/(100+x)=25/100   40+4x=100+x   3x = 60   x = 20   Answer is 20
<result>D</result>
How many kg of pure salt must be added to 100kg of 10% solution of salt and water to increase it to a 25% solution?