Mrs. Gina is planning a class party for 18 students. She will be serving orange juice. If she serves 500 mL per student, how many litres of juice will she need to make?
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Solution
Quantity of juice served to each student = 500 mL
Quantity of juice served to 18 students = 500 mL × 18 = 9000 mL
Since we know that 1 L = 1000 mL,
Litres of juice needed to be made = 9000 ÷ 1000 = 9 L