49) How many gallons of a 30% alcohol solution must be mixed with 60 gallons of a 14% solution to obtain a solution that is 20% alcohol? A) 12 gal B) 36 gal C) 27 gal D) 7 gal 50) A merchant has coffee worth $2 a pound that she wishes to mix with 9 pounds of coffee worth $8 a pound to get a mixture that can be sold for $4 a pound. How many pounds of the $2 coffee should be used? A) 18 lb B) 13.5 lb C) 27 lb D) 9 1b 51) Two pumps can fill a water tank in 45 minutes when working together. Alone, the second pump takes 3 times longer than the first to fill the tank. How long does it take the first pump alone to fill the tank? A) 80 min B) 67.5 min C) 33.75 min D) 60 min 52) A chemist needs 140 milliliters of a 49% solution but has only 1% and 57% solutions available. Find how many milliliters of each that should be mixed to get the desired solution. A) 30 mL of 1%; 110 mL of 57% B) 20 mL of 1%; 120 mL of 57% C) 120 mL of 1%; 20 mL of 57% D) 110 mL of 1%; 30 mL of 57%