13. Find the number of bricks, each measurincm Ă 12.5. cm Ă 7.5

1.	13. Find the number of bricks, each measurincm Ă 12.5. cm Ă 7.5 cm requiredconstruct a wall 6m long 5 m heigh andm thick, while mortar occupies 5% ofvolume of the wall
Answer» Volume of the wall = 650.5 =15 m3 1/20th of volume = 151/20 = 3/4 m3 So the volume to be covered by bricks =15−3/4=60−3/4=57/4m3 Volume of each brick =25/10012.5/100*7.5/100=0.00234375m3 Number of bricks=57/4/0.00234375=6080

13. Find the number of bricks, each measurincm Ă 12.5. cm Ă 7.5 cm requiredconstruct a wall 6m long 5 m heigh andm thick, while mortar occupies 5% ofvolume of the wall

Answer»

Volume of the wall = 6*5*0.5 =15 m3

1/20th of volume = 15*1/20 = 3/4 m3

So the volume to be covered by bricks =15−3/4=60−3/4=57/4m3

Volume of each brick =25/100*12.5/100*7.5/100=0.00234375m3

Number of bricks=57/4/0.00234375=6080