Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

Answer for first question is The volume of big cube=8*8*8=512 Volume of small cube=2*2*2=8 Volume of big cube/volume of small cube =number of small cubes so. 512/8=64 So 64 cubes made from big cube Answer for 3rd question.. 1m=100cm 2m=200cm Volume of cubiod=200*80*40= 640000cm3 Volume of cube= 20*20*20=8000cm3 Divide volume if cubiod/volume of cube=num of cubes

640000/8000=80 cubes

So 80 cubes are made from cubiod

Answer for fourth question Let edge of cube = a Volume of cube=a3 If side is doubled then side=2a Volume with new side=8a3 So the volume became 8 times Surface area =6*a2 New surface area =6*2a2 So surface area became 4 times

1. Volume of the first cube = 8×8×8 =512 cm3
Volume of the small cube =2×2×2 =8cm cm3
No. Small cubes that can be placed in the first cube=512/8=64 cubes
2.volume of the room = l×b×h
Area of floor = l×b
Therefore height= volume/(l×b) =270/67.5
=4m
3.volume of the whole block =200×80×40= 640000 cm3
Volume of a small block that had to be cut. 20×20×20 = 8000 cm3
Volume of the small cube =2×2×2 =8cm cm3
No. Small blocks that has to be cut from the whole block = 640000/8000=80 bolcks
4. Let the length of the edge of the cube be x.
So its surface area = 6×x×x
Now the edge of the cube is doubled
So new edge of the cube is 2x
So new surface area of the cube = 6×2x×2x
So the no. of times the surface area became of the new cube as compared to the cube of edge x = 6×2x×2x/6×x×x =4 times
So the no. of times the became of the new cube as compared to the cube of edge x = 2x×2x×2x/x×x×x = 8 times