120kg of an alloy A is mixed with 180 kg of alloy B. If alloy A has lead and tin in the ratio 2:3 and alloy B has tin and copper in the ratio 3:5, then the amount of tin in the new alloy is? Choices:  A) 100.6kg  B) 120.3kg  C) 139.5kg  D) 140.8kg  E) 114.5kg
Quantity of tin in 120kg of A = 120*3/5= 
<gadget id="calculator">120*3/5</gadget>
<output>72</output>
72kg   Quantity of tin in 180kg of B= 180*3/8= 
<gadget id="calculator">180*3/8</gadget>
<output>135/2 = around 67.5</output>
67.5kg   Quantity of tin in the new alloy= 72+67.5= 
<gadget id="calculator">72+67.5</gadget>
<output>139.5</output>
139.5kg   Answer is 139.5kg
<result>C</result>
120kg of an alloy A is mixed with 180 kg of alloy B. If alloy A has lead and tin in the ratio 2:3 and alloy B has tin and copper in the ratio 3:5, then the amount of tin in the new alloy is?