A nut store normally sells cashews, for $9.00 per pound and almonds for $3.50 per pound. But at the end of the month the almonds: had not sold well, so, in order to scll, 60 pounds of almonds, the manager mix the 60 pounds of almonds with some cashews and sell the mixture for $7.50 per pound. How many pounds of cashews should be mixed with the almonds to ensure no change in the revenue?
