The surface area of a cuboid is 386cm3, the bottom area is 40cm3, and the perimeter is 36cm?

The surface area of a cuboid is 386cm3, the bottom area is 40cm3, and the perimeter is 36cm?

The lateral area is 386-40 × 2 = 306 square centimeters
So the height is 306 △ 36 = 8.5cm
So the volume is 40 × 8.5 = 340 cubic centimeters

A rectangular wooden box, the bottom circumference is 3 meters, the surface area is 258 square decimeters
I can't do it,

What is the sum of the areas of the front, back, left and right sides of the wooden box
30 × 5 = 150 square decimeters
What is the bottom area of this wooden box
(258-150) △ 2 = 54 square decimeters

Fill in the blanks: a rectangular wooden box, bottom circumference is 3 meters, surface area is 258 square decimeters, the bottom area of this wooden box is () square decimeters

3 meters = 30 decimeters
258-30 × 5 = 258-150 = 108 square decimeters
108 △ 2 = 54 square decimeters

A rectangular wooden box, the bottom circumference is 3 meters, the height is 5 decimeters, the surface area is 258 square decimeters, how many square decimeters is the area under this wooden box
2. How many square centimeters less than the sum of the surface area of the original two cuboids is the surface area of a large cuboid made of two cuboid wood blocks of 10 cm, 8 cm and 6 cm in length, width and height

1. Solution: the length of the bottom is x decimeter
X*（30/2-X）*2 + X*5*2 + （30/2 - X）*5*2 = 258
2X² -30X +54 = 0
X = 6 or 9
So it's 9 long and 6 wide
The bottom area is 6 * 9 = 54 square decimeters
Two or three possibilities
The first is that the bottom overlaps the top
Reduced by 10 * 8 * 2 = 160 square centimeters
The second is the overlap of the left side and the right side
Reduced by 8 * 6 * 2 = 96 square centimeters
The third is that the front and the back overlap
Reduced by 10 * 6 * 2 = 120 square centimeters