A 20 kg metal bar made of alloy of tin and silver lost 2 kg of its weight in the water. 10 kg of tin loses 1.375 kg in the water; 5 kg of silver loses 0.375 kg. What is the ratio of tin to silver in the bar?  Choose the correct choice:
A) 1/4  B) 2/5  C) 1/2  D) 3/5  E) 2/3
The bar lost certain percentage of its weight. We don't know how much tin was lost and how much silver was lost but in all 2 kg was lost with is 10% of its overall weight.   Tin loses 1.375 kg in 10 kg so 13.75% of its weight when it is put in water.   Silver loses .375 kg in 5 kg so  .375/5 * 100= 
<gadget id="calculator"> .375/5 * 100</gadget>
<output>7.5</output>
7.5% of its weight in water.   Now, we just need to use weighted averages:   Wt/Ws= (7.5 - 10)/(10 - 13.75) = 2.5/3.75 = 2/3   Answer (2/3)
<result>E</result>
A 20 kg metal bar made of alloy of tin and silver lost 2 kg of its weight in the water. 10 kg of tin loses 1.375 kg in the water; 5 kg of silver loses 0.375 kg. What is the ratio of tin to silver in the bar?