Question

A wall 24 m long 5 m high and 0.25 m rhick is to be constructed using bricks measuring 25cm X 12.5 cm × 7.5 cm.Find the no. of bricks required, if 5% of the wall is occupied by cement and sand mixture.

Answer 1

volume of wall=24×5×0.25=30m³
volume of cement and bricks=5% of wall=5/100×30=1.5m³
volume of wall that contain only bricks=30-1.5=28.5m³
volume of brick=25×12.5×7.5=3/1280
no of bricks=28.5/3/1280=285×128  /3=12160 bricks

Answer 2

number of bricks is12160