Each liter of water holds 1000 mL. Mary's goal is to drink 1.5 liters of water a day, which in mL is 1.5 L * 1000 mL/L = <<1.5*1000=1500>>1500 mL
To reach her goal, Mary should drink 1500 mL / 250 mL/glass = <<1500/250=6>>6 glasses of water per day.
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