Same as original, density = mass / volume, cutting the block in two pieces or any number of pieces doesn't change the density as ratio m/v remains constant.
The percent error is 34.28 %.
Hope this helps! Be safe out there.
ANSWER

EXPLANATION
The volume of a cylinder is given by the formula:

The given cylinder has diameter 6. This means that, the radius is


The is height is


We substitute the values into the formula to obtain;



The volume is

to the nearest hundredth
The two angles given are vertical angles which mean they are the same.
x +40 = 60
Subtract 40 from both sides:
x = 20