Solve using matrices: word problem: Marissa decides to go to the farmer’s market and pick up some fresh berries for a fruit salad. She can purchase raspberries for $3.00 a pound, blueberries for $4.00 a pound, and cherries for $8.00 a pound. She is making 140 pounds of fruit salad, and plans to sell her fruit salad during a county fair. Marissa wants to charge $6.00 for a pound of her fruit salad. If twice as many raspberries are used than blueberries, how many pounds of each type should Marissa use?

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