[Math] Question on volume of swimming pool

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Swimming pool is of length 20m, wide 5m and height of the swimming pool increase from the 1.6m to 4.4m.

What is the volume of swimming pool?

How I approached:
Area of swimming pool = Area of cube + Area of prism

Area of cube = l * b * h

So

Area of cube = 20 * 5 * 1.6
Are of prism = ???

Best Answer

No calc needed here:

$20\times5\times1.6$ for the cube $= 160$.

$20 \times 5 \times \frac{ 4.4 - 1.6 }2$ for the prism $= 140$ (just take the average of the two heights since the bottom is flat, if it were curved then we get into calc).

Total is $300$.

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