The gold coin

The gold coin contains 900 per mille of pure gold. The coin weighs 950g. How much per mille is gold? How many grams are gold?

Correct result:

p =  900
m =  855 g

Solution:

p=900=900 ‰
m0=950 g  m=m0 p1000=950 9001000=855 g



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