Question 675591
A merchant has coffee worth $50 a pound that she wishes to mix with 70 pounds of coffee worth $80 a pound to get a mixture that can be sold for $70 a pound. How many pounds of the $50 coffee should be used?
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let x=amt of $50 coffee should be used
50x+80*70=70(x+70)
50x+5600=70x+4900
20x=700
x=35
amt of $50 coffee should be used=35 pounds