This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
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
1 2 1