Question 709234


 bricks,each of dimensions {{{20cm*12cm*9cm}}}, required to build a wall {{{a=12m}}} long, {{{b=72cm}}} thick {{{h=4m }}} height:

first find a volume of a wall: {{{V[w]=a*b*h}}}

{{{V[w]=12m*72cm*4m}}}.......{{{b=72cm=(72/100)m=0.72m}}}

{{{V[w]=12m*0.72m*4m}}}

{{{V[w]=34.56m^3}}}

now find a volume of a brick dimensions {{{V[b]=20cm*12cm*9cm}}}

{{{V[b]=0.20m*0.12m*0.09m}}}

{{{V[b]=0.00216m^3}}}

now divide a volume of a wall by a volume of a brick

{{{V[w]/V[b]=34.56m^3/0.00216m^3}}}

{{{V[w]/V[b]=34.56cross(m^3)/0.0021cross(6m^3)}}}

{{{V[w]/V[b]=34.56/0.00216}}}

{{{V[w]/V[b]=16000}}}....... bricks required to build a wall