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Brando is making soup using two types of beans. He mixes 2 pounds of black beans that cost $1.35 per pound with 3 pounds of lentils that cost $1.75 per pound. What is the cost per pound of the bean mixture?
A、$1.40
B、$1.51
C、$1.55
D、$1.59
E、$1.70
答案：D
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