# Rain

How many mm of water rained the roof space 75 m2 if the empty barrel with a radius of 8 dm and height 1.2 m filled to 75% its capacity? :-)

Result

x =  24.127 mm

#### Solution:

$x=0.75 \pi \cdot \ 0.8^{ 2 } \cdot \ 1.2/75 \cdot \ 1000 = 24.127 \ \text{ mm }$

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