A cone-shaped grain pile is 1.5 meters high, covering an area of 16 square meters. This pile of grain is put into the granary, accounting for just two fifths of the granary Find the volume of this granary

A cone-shaped grain pile is 1.5 meters high, covering an area of 16 square meters. This pile of grain is put into the granary, accounting for just two fifths of the granary Find the volume of this granary

The volume of this granary
= 16 × 1.5 / 3 / (2/5)
= 16 × 7.5 / 6
=20 cubic meters

A cone-shaped grain pile, 8 meters, covers an area of 15 square meters, this pile of grain into the granary just accounts for two seventh of the volume of this granary

Conical grain pile volume = 1 / 3 * 15 * 1.8 = 9 cubic meters
The volume of this granary is 9 ／ 2 / 7 = 31.5 cubic meters

A snail, climbing a tree 9m high, rises 1m during the day and declines 1 / 3M at night. It starts to climb up one morning, and how many days later can it reach the top of the tree?
Excuse me

（9-1）/（1-1 /3）
=8/(2/3)
=8*3/2
=12 (days)
Add in the last 1 meter during the day, so it will take 13 days to reach the top of the tree

A classroom is 8.5 meters long and 7.2 meters wide. The walls and ceiling are painted with lime. The area of doors and windows in the classroom is 24 square meters?
A classroom is 8.5 meters long and 7.2 meters wide. The walls and ceiling are painted with lime. The area of doors and windows in the classroom is 24 square meters. If 0.2 kg of lime is used per square meter, how many kg of lime should be used?

8.5 times 7.2 = 61.2 () 8.5 times 3 times 2 = 51 ()
7.2 times 3 times 2 = 43.2 () 61.2 + 51 + 43.2 = 155.4 ()
155.4-24 = 131.4 () 131.4 times 0.2 = 26.28 (kg)

A classroom is 16 meters long, 7 meters wide and 3 meters high. The area of doors and windows is 6 square meters. How many square meters is the area of painting the wall? (is the roof area the wall area? Why?
To be detailed, understand, thank you, there will be extra points

(16 + 7) * 2 * 3 = wall area,
Wall area - door and window area = actual construction area;
16 * 7 = top surface area;
Top surface area + actual wall construction area = overall construction area
The top surface area should be calculated, because it is also a part of the construction

A classroom is 8 meters long and 6 meters wide. Its doors and windows cover an area of 18 square meters. It needs to paint the walls and roofs around it. How many liters of paint are needed for each liter of 12 square meters of paint?

8*3*2=48
6*3*2=36
8*6=48
48+48+36-18=114
114 / 12 = 9.5l

The length of a classroom is 8 meters, the width is 6.5 meters, the height is 3.2 meters, and the area of doors and windows is 2 square meters. The four walls and roof of the classroom should be painted, and the painting area should be calculated

8x6.5 2x(8x3.2 6.5x3.2)
=53 2x(25.6 20.8)
=136.8 (M2)
136.8-2 = 134.8 (M2)
A: the painting area is 134.8 square meters

Paint the four walls and roof of the classroom. The classroom is 8 meters long and 6 meters wide, deducting the area of doors and windows of 21.7 square meters
With 0.5 kg of paint, how many kg of paint is needed at least?

8*6+3*6*2+3*8*2-21.7=48+36+48-21.7=110.3
110.3*0.5=55.15Kg

The length of the room is 4.5 meters, the width is two-thirds of the length, and the height is 2.8. To paint the walls, the roof, the area of the doors and windows is 6 square meters. How many kilograms of paint do you need to use 0.4 kg of paint per square meter

About 12.8kg coating, is calculated according to what you said!

A classroom is 6 meters long, 4 meters wide, 3 meters high, with 7 square meters of doors and windows. What is the painting area of the four walls and the roof? When painting once, 0.15 kg of paint per square meter, the first time
To paint? The paint required for the second time is 1 / 3 of that for the first time. The paint required for the second time will be worn out in the actual painting. Therefore, it is necessary to prepare more 1 / 10 of the actual paint and hand it in tomorrow

This is a good one
6*4+6*3*2+4*3*2-7=77
77*0.15=11.55
1/3*11.55=3.85
(11.55+3.85)*(1+1/10)=16.94