Problema Solution
Old silver coins contain 90% silver. Silver solder contains 63% silver. If you wanted to make 200 kilograms of an alloy containing 82% silver, how many kilograms of old coins, and how many kilograms of silver solder could you melt together to so this.
Answer provided by our tutors
Let
x = kg of old silver coins
y = kg of solver solder
x + y = 200
0.90x + 0.63y = 0.82*200
........
........
x = 140.74 kg
y = 59.26 kg
140.74 kg of coins and 59.26 kg of silver solder should be melted together.