It takes 3 tons of copper ore and 5 tons of iron ore to make one ton of alloy A. How many tons of alloy A can be made from 30 tons of copper ore and 80 tons of iron ore?	Choose the correct choice
A) 18 B) 18 3/4 C) 17 D) 16 E) 14
Yes, you need copper ore:iron ore in the ratio 3:5. Total 8 tons of the mix in this ratio will give 1 ton of alloy A.   If you have 30 tons of copper ore, it is enough for 30/3= 
<gadget id="calculator">30/3</gadget>
<output>10</output>
10 tons of alloy A.   If you have 80 tons of iron ore, it is enough for 80/5= 
<gadget id="calculator">80/5</gadget>
<output>16</output>
16 tons of alloy A.   Since iron ore is available for only 16 tons of alloy A, you can make only 16 tons of alloy A.   The leftover copper ore alone cannot make any alloy A and hence will be leftover only.   Answer must be 16.   (16)
<result>D</result>
It takes 3 tons of copper ore and 5 tons of iron ore to make one ton of alloy A. How many tons of alloy A can be made from 30 tons of copper ore and 80 tons of iron ore?