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A school provides milk to its students in cylindrical glasses, each with a diameter of 7 cm. If each glass is filled with milk to a height of 12 cm, how many litres of milk are needed to serve 1600 students? Use 1000 cm³ = 1 litre.

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With radius 3.5 cm and height 12 cm, one glass holds (22/7) × 3.5² × 12 = 462 cm³. For 1600 students, total milk is 1600 × 462 = 739,200 cm³ = 739.2 litres.

Ganita Manjari Part 2  Class 9 Chapter 14 Step by Step Solutions
Class 9 Chapter 14 Math of Space Surface Area and Volume (Ganita Manjari 2) Solutions

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1 Answer

  1. The diameter is 7 cm, giving radius r = 3.5 cm and height h = 12 cm. Volume per glass is πr²h = (22/7) × (7/2) × (7/2) × 12 = 22 × 7 × 3 = 462 cm³. For 1600 students, the total milk needed is 1600 × 462 = 739,200 cm³. Using the conversion 1000 cm³ = 1 litre, this equals 739,200 / 1000 = 739.2 litres of milk.

     

    For more NCERT Solutions of Class 9 Maths Ganita Manjari Part 2 Chapter 14 Math of Space: Surface Area and Volume Question Answer (2026-27)

    https://www.tiwariacademy.com/ncert-solutions/class-9/maths/ganita-manjari-chapter-14/

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