You were invited to go pick berries in a field with your friends. You have $25 to spend and want to pick 21 pounds of berries. Strawberries are $1.40 a pound, raspberries are $1.30 a pound and
blueberries are $1.10 a pound. You decide to pick twice as many blueberries than strawberries and
raspberries combined.
How many pounds of each berry did you purchase?