In one alloy there is 10% chromium while in another alloy it is 6%. 15 kg of the first alloy was melted together with 35 kg of the second one to form a third alloy. Find the percentage of chromium in the new alloy.
Select
A) 7.2%
B) 9%
C) 9.2%
D) 8.6%
E) 8.4%
The amount of chromium in the new 15+35= 
<gadget id="calculator">15+35</gadget>
<output>50</output>
50 kg alloy is  0.10*15+0.06*35= 
<gadget id="calculator"> 0.10*15+0.06*35</gadget>
<output>3.6</output>
3.6 kg, so the percentage is  3.6/50*100= 
<gadget id="calculator"> 3.6/50*100</gadget>
<output>7.2</output>
7.2%.   7.2%nswer: 7.2%.
<result>A</result>
In one alloy there is 10% chromium while in another alloy it is 6%. 15 kg of the first alloy was melted together with 35 kg of the second one to form a third alloy. Find the percentage of chromium in the new alloy.