Question

question no. 20 pls

Answer 1

Volume of wall = ( 24 × 5 × 0.25 ) m^3 = 30m^3

Volume of 1 brick = (25/100 × 12.5/100 × 7.5/100) m^3 = 0.00234375

Volume of wall which is not covered by bricks = (5/100 × 30) m^3 = 1.5
Volume of wall which is covered by bricks
=(30-1.5)m^3 = 28.5 m^3
So number of bricks
= 28.5 / 0.00234375
= 12160

Hope that this will help you.
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