The volume of a bucket is 24 cubic decimeters, the bottom area is 7.5 square decimeters, and there is a hole 0.7 decimeters away from the bucket mouth. Now the bucket can hold water at most______ Kg. (1 kg per cubic decimeter of water)

The volume of a bucket is 24 cubic decimeters, the bottom area is 7.5 square decimeters, and there is a hole 0.7 decimeters away from the bucket mouth. Now the bucket can hold water at most______ Kg. (1 kg per cubic decimeter of water)

Now this bucket can hold water: 1 × (24-7.5 × 0.7), = 1 × (24-5.25), = 18.75 (kg); answer: now this bucket can hold water up to 18.75 kg. So the answer is: 18.75

To make a cylindrical bucket with no cover iron sheet, the bottom diameter is 4 decimeters and the height is 5 decimeters. How much iron sheet does it need at least?

Sheet iron = 2 * 2 * 3.14 + 4 * 3.14 * 5 = 75.36 square decimeters

A cylindrical tin bucket without cover, 6.28 decimeters high, its side is just a square
How many square decimeters of iron sheet does it take to make this bucket

The circumference of the bottom of the bucket is also 6.28 decimeters
Bottom radius of bucket = 6.28 △ 3.14 △ 2 = 1 (decimeter)
To make this bucket, we need the area of iron sheet
=3.14×1×1+6.28×6.28
=3.14+39.4384
=42.5784 (square decimeter)