11 I wish to repaint the walls of my garage. It is 3 metres high, 4 metres wide and 9 metres deep. I
shall not need to paint the electronic door which covers one 3 x 4 metre end, nor the window, which
is 2 metres wide and 1 metre high, nor the rear door which is 1 metre wide and 2 metres high. 1
litre of paint covers 3 square metres.
How many 1 litre tins will be needed to complete the painting?

45 tins will be needed.

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To solve this question, the surface area of a rectangular prism need to be found. With the surface area that will be painted, it is possible to find the number of 1 liter tins that will be needed.

Surface area:

The surface area of a rectangular prism with height h, width w and depth d is:

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Total surface area:

Thus, the total surface area, in square meters, will be:

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Area painted:

These following areas will be removed:

Thus, the total area painted will be:

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How many tins?

Thus:

Rounding up:

45 tins will be needed.

A similar question is given at link

33 tins

Step-by-step explanation:

4*9=36 m^2 - the ceilling

2*(9+4)*3 the walls

you have to paint 4*9+2*(9+4)*3-(3*4+2*1+1*2)=36+78-16=98 m^2

98<99

99:3=33 l will be needed

asdasdsad

step-by-step explanation:

6. 104

7. 52/37

8. 2704

9. 140608

10. -52

11. |52|=52

12. 1/52

13. 156

14. 26

15. 40

16. 37

17. -364

18. 53 1/3

19. 50.96

20. 43 2/3

21. 78

22. 50.75

23. 47.63

24. 163.28

25. 10400

26. 338

27. 208

28. 2704 square inches

29. 312 square meters

30. don't know what its asking, tell me so i can tell you

31. 8490.56

32. 52 degrees would be an acute angle

33. 128 degrees

34. 20.8

35. 39

36. 208