The charging standard of tap water for residents is as follows: each household uses less than 4 tons of water per month, which is 1.8 yuan per ton. When it exceeds 4 tons, the excess part is 3 yuan per ton______ Yuan

The charging standard of tap water for residents is as follows: each household uses less than 4 tons of water per month, which is 1.8 yuan per ton. When it exceeds 4 tons, the excess part is 3 yuan per ton______ Yuan

The receivables of two households less than 4 tons: 1.8 × (4 + 4) = 14.4 (yuan), the water consumption of two households more than 4 tons in this month: (26.4-14.4) △ 3 = 4 (ton), the water consumption of Party B: (4 + 4 + 4) × 35 + 3 = 4.5 (ton), the water fee payable by Party B: 4 × 1.8 + (4.5-4) × 3, = 7.2 + 1.5, = 8.7 (yuan); answer: the water fee payable by Party B is 8.7 yuan

It is known that the radius length of No. 1 circle is equal to the diameter length of No. 2 circle, and the sum of its area is 100C m2. What is the area of No. 1 circle?

100÷（1×1 + 2×2）×（2×2）
=100÷5×4
=80 (square centimeter)

1. A cube container with 8cm edge length is filled with water. Pour the water into another cuboid container, which is 16cm long and 10cm wide. How deep is the water poured?
2. A rectangular iron sheet is 60cm in length and 40cm in width. The square with 10cm in side length is cut from four corners, and then it is made into a box. What is the volume of the box?
3. A cuboid steel with a volume of 2800 cubic centimeter and a cross section of a cube with a side length of 4cm. Cut off 70cm, how long is the rest just now?
4. On a cube block with an edge length of 8cm, dig out a small cube with an edge length of 2cm at the center of the front, back, left, right, upper and lower surfaces. What is the surface area of the block?

1.8*8*8/16/10=3.2CM
2.（60-20）*（40-20）*10=8000
3.2800/4/4-70=105
4.8*8*6+6*2*2=408