Problema Solution
A metallurgist needs to make 12.4 lb. of an alloy containing 50% gold. he is going to melt and combine one metal that is 60% gold with another metal that is 405 gold. How much of each should he use?
Answer provided by our tutors
set the first metal xlb,
the second metal ylb,
60%x+40%y=50%(x+y),
x+y=12.4;
then
x=y=6.2;
each should be used 6.2lb.