Answer:
Total mass of the sculpture is 11.07 tons .
Explanation:
Formula

Where r is the radius and h is the height .
Volume of a cuboid = Length × Breadth × Height
As given
A sculpture is formed from a cylinder resting on top of a cuboid.
The cylinder has a radius 40cm and height 70cm. the cuboid measures 80cm by 80cm by 140cm .

Total volume = Volume of a cylinder + Volume of a cuboid

Total volume = 351680 + 896000
= 1247680 cm³
Formula
As given
The sculpture is made from steel , the steel has a density of 8.05g /cm³ .

Mass = 8.05 × 1247680
= 10043824 g
As 1 tons = 907185 grams

Convert 10043824g into tons .

= 11.07 tons
Therefore the total mass of the sculpture is 11.07 tons .