(i) No, drinking 2.5 L daily for 80 years totals ~73 m³, far less than a standard ~200 m³ classroom. (ii) For a 30 ft × 20 ft × 10 ft classroom, roughly 8,000 to 10,000 standard bricks are required.
Cbse Class 9 Maths Ganita Manjari Part 2 Solutions
Class 9 maths ganita manjari part 2 chapter 14 question answer
(i) Drinking 2.5 litres daily for 80 years totals 2.5 × 365 × 80 = 73,000 litres = 73 m³. A typical classroom (8 m × 7 m × 3.5 m) has a volume of nearly 200 m³, so the answer is no. (ii) A standard classroom perimeter of 100 ft with height 10 ft gives 1,000 sq ft wall area. Accounting for doors, windows and mortar, approximately 8,000 to 10,000 bricks are needed.
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