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The volume of a sphere is equal to  \frac{4}{3}  \pi  r^{3}

So in order for us to know the increase in water level we need to know first the volume

The increase in height is equal to the volume of the sphere*3/base area of the cylinder.

 \frac{3( \frac{4}{3}  \pi  5^{3} )}{ \pi  6^{2} }  = \frac{4*125 \pi }{36 \pi }   = \frac{125}{9}=13 \frac{8}{9}

Therefore the increase in height is 13 \frac{8}{9} cm

If you need the water level after the 3 balls were put just add 70/2=35 cm
then this would result to a height of 48 8/9 cm
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