would anyone be kind enough to explain (simply!) how to calculate the following questions:

A water tank is 5 metres long, 4 metres wide and 1.5 metres dee. it is filled using a bucket which holds 1/20 of a cubic metre of water. how many bucketfuls are needed to fill the tank?

2) In the fantasy game creatures have different powers.

5 Elves match 2 wizards

6 deveils match 5 wizards

4 elves match 3 sprites

(a) How many elves match 12 devils? - (I worked this one out)

(B) How many sprites match 8 wizards? - (I have also managed to work this one?

)

(C)How many devils match 20 elves plus 7 wizards? - (I think I've worked this out.)

(D) How many sprites match 24 devils plus 12 wizards?

(E) 15 elves plus 12 devils are matched by 8 wizards plus x sprites. what is the value of x?

A solid letter T is made by glueing together 5 cubes each edge one CM. write down the total surface area of the letter in square CMs. (I have got the answer but can't figure out how arrived at the answer)

A block of metal weighing 180 gms has a volume of 20 cubic CMs. write down the weight in KGs of a block of the same metal which is 1M long, 20CMs wide and 2 CMs thick.