The proportion of copper and zinc in the brass is 13:7. How much zinc will there be in 100 kg of brass? Choose the most appropriate option
A) 37 kg	B) 35 kg	C) 85 kg	D) 45 kg	E) 25 kg
7/20 * 100= 
<gadget id="calculator">7/20 * 100</gadget>
<output>35</output>
35   Answer: 35 kg
<result>B</result>
The proportion of copper and zinc in the brass is 13:7. How much zinc will there be in 100 kg of brass?