CBSE Class 10 Mathematics
Question 35 of 35
Surface Areas and Volumes — Question Ex 13.5 Q3
Back to all questions Ex 13.5 Q3
Question A cistern measuring 150 cm x 120 cm x 110 cm has 129600 cm3 water in it. Porous bricks are placed in the water until the cistern is full to the brim. Each brick absorbs one seventeenth of its own volume of water. How many bricks can be put in without overflowing the water, each brick being 22.5 cm x 7.5 cm x 6.5 cm?
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Mathematics | Surface Areas and VolumesWeb Content
CBSE Class 10 Surface Areas and Volumes — Complete Guide
This chapter carries 5-6 marks covering combination of solids, conversion problems, and frustum of a cone.
Quick Revision: Key Concepts
- Combination: Add CSAs (subtract hidden faces for TSA), add volumes
- Conversion: Volume is conserved when solid is melted and recast
- Frustum: V = ⅓πh(R² + r² + Rr), l = √[h² + (R−r)²]
- Water flow: Volume = cross-section area × speed × time
Most Important Questions
- SA and volume of combined solids (tent, capsule, toy)
- Solid melted and recast into smaller solids (find number)
- Frustum volume and surface area (bucket problems)
- Water flow and pipe problems
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