In one alloy there is 12% chromium while in another alloy it is 8%. 15 kg of the first alloy was melted together with 30 kg of the second one to form a third alloy. Find the percentage of chromium in the new alloy. Choose the correct answer
A) 9.4%
B) 9.33%
C) 9.6%
D) 9.8%
E) 10%
The amount of chromium in the new 15+30= 
<gadget id="calculator">15+30</gadget>
<output>45</output>
45 kg alloy is  0.12*15+0.08*30= 
<gadget id="calculator"> 0.12*15+0.08*30</gadget>
<output>4.2</output>
4.2 kg, so the percentage is 4.2/45*100=   9.33%.   Answer: 9.33%.
<result>B</result>
In one alloy there is 12% chromium while in another alloy it is 8%. 15 kg of the first alloy was melted together with 30 kg of the second one to form a third alloy. Find the percentage of chromium in the new alloy.