An alloy of zinc and copper contains the metals in the ratio 5 : 3. The quantity of zinc to be added to 16 kg of the alloy so that the ratio of the metal may be 3 : 1 is:  Choose the correct choice from the following choices:
A) 2
B) 4
C) 8
D) 3
E) 1
5/8*16= 
<gadget id="calculator">5/8*16</gadget>
<output>10</output>
10   3/8*16= 
<gadget id="calculator">3/8*16</gadget>
<output>6</output>
6   (10+x)/6=3/1   =8   ANSWER:8
<result>C</result>
An alloy of zinc and copper contains the metals in the ratio 5 : 3. The quantity of zinc to be added to 16 kg of the alloy so that the ratio of the metal may be 3 : 1 is: