Question

How many bricks 15cm ×10cm × 6cm are needed to construct a wall 10m long 0.3m thick and 6m high?

Answer 1

convert metre into centimetre.

10m= 100cm

0.3m= 30 cm

6m=600cm

volume of wall= (l×b×h)

=100×30×600

= 1,800,000cm^3

volume of brick=(l×b×h)

=15×10×6

=900cm^3

number of bricks= 1800000/900

=2000 bricks will be needed.

Answer 2

The number of bricks required to construct the wall=20000

Step-by-step explanation:

Dimension of bricks are 15cm by 10cm by 6cm

Length of wall=10m

Breadth of wall=0.3 m

Height of wall=6m

Volume of cuboid=$l\times b\times h$

Where l=Length of cuboid

b=Breadth of cuboid

h=Height of cuboid

Using the formula

Volume of 1 brick=$15\times 10\times 6=900cm^3$

Volume of 1 brick=$900\times 10^{-6}m^3$

Because $1 cm^3=10^{-6}m^3$

Volume of wall=$10\times 0.3\times 6=18m^3$

Number of bricks=$\frac{volume\;of\;wall}{volume\;of\;brick}$

Number of bricks=$\frac{18}{900\times 10^{-6}}$

Number of bricks=$\frac{18\times 10^6}{9\times 10^2}=2\times 10^{6-2}=2\times 10^4=2\times 10000=20000$

By using identity :$\frac{1}{a^x}=a^{-x},a^x\div a^y=a^{x-y},a^n=a\times a\times a..n times$

Hence, the number of bricks required to construct the wall=20000

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https://brainly.in/question/1851996:answered by Vishank