Brick wall

Garden 70 m long and 48 m wide should surround with wall 2.1 meters high and 30 cm thick. Wall will be built on the garden ground. How many will we need bricks if to 1 m³ is required approximately 300 bricks?

Correct answer:

n =  44378

Step-by-step explanation:

a=70 m b=48 m c=2.1 m h=30 cm m=30/100  m=0.3 m  S1=a b=70 48=3360 m2 S2=(a2 h) (b2 h)=(702 0.3) (482 0.3)=8223925=32891425=3289.56 m2  V=(S1S2) c=(33603289.56) 2.1=147.924 m3  n=300 V=300 147.924=44378



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Showing 2 comments:
#
Math student
unprecise - need to know if wall needs to be build ON garden-ground (like in the solution) or if wall should enclose whole garden - in that case:
2.1 * ( 2 * 48 + 2 * 70 ) * 0.3 * 300 = 44604 does the trick

#
Dr Math
thank you, we corrected the wording of the problem. But your solutions 44604  tricks is also wrong because in the corners some bricks are not counted.

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