A nut store normally sells cashews for 4 00 per pound and peanuts for 1 50 per pound But at the end of the month the peanuts had not sold well so in order to sell 90 pounds c peanuts the manager decided to mix the 90 pounds of peanuts with some cashews and sell the mixture for 2 50 per pound How many pounds of cashews should be mixed with the peanuts to ensure no change in the revenue The manager should mix pounds of cashews with the peanuts