Question

4. How many cubic metres of earth must be dug
out to make a well 28 m deep and 2.8 m in
diameter ? Also, find the cost of plastering its
inner surface at 4.50 per sq. metre.
5. What length of solid cylinder 2 cm in diameter
must be taken to recast into a hollow cylinder
of external diameter 20 cm, 0.25 cm thick and
15 cm long ?​

Answer 1

Answer:

how many cubic metre of earth must be dug out of 12 8 2018 Deep and 2.8 metre and diameter also find the cost of plastering it in a surface at 2:50 per square metre wide length of solid cylinder 2 cm in diameter must be taken to reset into a hollow of external diameter 20 25 cm and 15 metre long