A metal alloy weighing 11 kg and containing 2% platinum is melted and mixed with 6 kg of a different alloy which contains 36% platinum. What percent of the resulting alloy is platinum?

1 Answer
anor277
Jan 17, 2017

Approx. #15%#

Explanation:

#"% of platinum"# #=# #"Total mass of platinum"/"Total mass of alloy"xx100%.#

#(2%xx11*kg+36%xx6*kg)/(11*kg+6*kg)xx100%#

#=(2.38*kg)/(17*kg)xx100%=??%#

The spot price for platinum is currently #£25-24*g^-1#. What is this lump worth?

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