[Z|2.Saki]

4.  A 1.540 gram sample of an alloy containing only tin and zinc was reacted with excess fluorine gas to
     produce 2.489 grams in total of a mixture of  tin(IV) fluoride and zinc fluoride.
   
     (b) Calculate the percent composition by mass of the two metals in the alloy.

1mol of Zn = 65.409g
1mol of Sn = 117.710g
1mol of F = 18.99840g

**Please Show Steps please, and also with define each step you are doing in-case I don't understand.

I am not sure what to start with, since there are so many variables
 Thanks for Helping !

[Borek]

You have two unknowns (amounts of tin and zinc) and you can write two equations (mass of alloy and mass of fluorides). That gives two equations in two unknowns - simple algebra.

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