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Sam and Julia are running a lemonade stand. Sam is selling regular lemonade for $0.50 per cup, while Julia is selling pink lemonade for $0.75 per cup. In total, they sell 140 cups of lemonade and make $90. Define x = number of regular lemonade cups that Sam sells Define y = number of pink lemonade cups that Julia sells (a) Write a system of equations that represents this situation. (b) Find how many cups of regular lemonade that Sam sold. Response area (c) Find how many cups of pink lemonade that Julia sold. Response area