<PRE><B>Question 408794</B>
a store sells regular coffee for $4 a pound
and a gourmet coffee for $7 a pound
to get rid of 40 pounds
of the gourmet coffee,the shopkeeper plans to make
a gourmet blend to sell
for $5 a pound.
how many pounds of regular coffee should be used? 

..

let x=pounds of regular coffee to be use to make the blend
cost of this regular coffee=4x
cost of the gourmet coffee=40*7=280
cost of the new blend=(40+x)*5

4x+40*7=(40+x)*5
4x+280=200+5x
x=80 pounds
ans:
80 pounds of regular coffee should be used to make a gourmet blend.</PRE>