Question 899568
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Hi
x+y=80
 x=-y+80 
 33(x)+25(y)=24
 33(-y+80)+25y=2400  Nice Work...careful to the finish line 
 -33y+(2640)+25y=2400  
   -8y = -240
     y = 30, number of 25cent stamps.  50 33cent stamps {{{80-30}}}
CHECKING our answer***
 30*25 + 50*33 = 2400