Bricks pyramid

How many 50cm x 32cm x 30cm brick needed to built a 272m x 272m x 278m pyramid?

Correct answer:

n =  107122667

Step-by-step explanation:

$$\begin{gathered} 278m=2780dm=2^2\times 5\times 139dm \\ 272m=2720dm=2^5\times 5\times 17dm \\ a=272\text{ m } \\ h=278\text{ m } \\ x=50\text{ cm}\to \text{ m}=50\mathrm{/}100\text{ m}=0.5\text{ m } \\ y=32\text{ cm}\to \text{ m}=32\mathrm{/}100\text{ m}=0.32\text{ m } \\ z=40\text{ cm}\to \text{ m}=40\mathrm{/}100\text{ m}=0.4\text{ m } \\ {V}_0=x\cdot y\cdot z=0.5\cdot 0.32\cdot 0.4={\displaystyle \frac{8}{125}}=0.064{\text{m}}^3 \\ V={\displaystyle \frac{1}{3}}\cdot a^2\cdot h={\displaystyle \frac{1}{3}}\cdot 272^2\cdot 278\doteq 6855850.6667{\text{m}}^3 \\ n=V\mathrm{/}{V}_0=6855850.6667\mathrm{/}0.064=107122667 \end{gathered}$$

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