Question 355016
80% gold (in weight)  let this be x kg
another alloy contains 55% gold. this will be 40-x kg
Mix 40kg of an alloy that contains 70% gold?
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80x+55(40-x)=40*70
80x+2200-55x=2800
25x=2800-2200
25x=600
x=600/25
x= 24 kg ----- 80% gold
balance 16 kgs will be 55% gold alloy
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m.ananth@hotmail.ca