I will be very glad if u could extend your kind helping hands to me. Here are the questions that i have:

1.A square sheet of dimension 3ft is to be laid on a roof of diamension 30ftx15ft. How much sheet can you laid on the roof?

2. A cubical dice is to be made out from a steel rod of radius 30mm and length 8m. If the dice is to be made of diamension 15mm,how much dice can you make?

3.A water tank having 20000 litres is to be constructed. The ground area is of limited space and no other problems whatsoever. Is a cuboidal or cylindrical tank most preferable?

4. A 242cu.m cylinder of height 7m is transformed to a cuboidal box of length 4m and breadth 2m. Find the height of the cube thus formed. Find the Total  Surface Area of the cuboid?

If you can help me, i will be forever grateful to you.