x-(x/3+4)-(x/3+4)= 10
The solution is x=54 (m)
2. The air ticket of a named passenger is X yuan.
x+(25-20)× 1.5% x = 1075
The solution is x= 1000 yuan.
It takes x days to complete the design.
20/30=x/ 12
X=8 days
The total surface area of paragraphs 4 and 3 is increased by 12.56 square decimeter compared with the original surface area, which actually increases the area of two cylindrical floors.
The area of a ground of a cylinder is 12.56÷2=6.28 square decimeter.
The length of each cylinder is1/3×1.5×10 = 5 decimeters.
The volume of each section of steel is 6.28×5=3 1.4 cubic decimeter.
The mass of each section of steel is 31.4× 7.8 = 244.92kg.