Q4. ​A Wall is to be built using bricks of dimensions 20 cm x 16 cm x 8 cm. How  many bricks will  be required to build if the wall is 10 m long, 5 m high 64 cm thick? 

Dear Student,
Here is the solution of your asked query:
Q.4. Volume of wall=10m×5m×0.64m=32m3And volume of each brick=0.2m×0.16m×0.08m=0.00256m3So number of bricks required=Volume of wall volume of each brick=320.00256=12500Therefore total number of bricks required to build a wall = 12500
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