SHOW TIMER STATISTICS
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 60 tons of copper ore and 90 tons of iron ore?	Choose the correct choice.
A) 18 B) 18 3/4 C) 20 D) 30 E) 50
3c + 5i = a   60c + 90i = ?   20(3c + 5i) = 60c + 100i = 20a, so the answer has to be less than 20 since we are dealing with 90i.   But, 18(3c + 5i) = 54c + 90i = 18a, here we get 54c &lt; 60c. So answer must be 18 3/4 (B).   ANSWER:18 3/4
<result>B</result>
SHOW TIMER STATISTICS
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 60 tons of copper ore and 90 tons of iron ore?