Question

6.
Volume of a cube is 1,000 cm'. Find its total surface area.
x 30 m.
7. How many planks each of which is 2 m long, 2.5 cm broad and 4 cm thick can be
cut off from a wooden block 6 m long, 15 cm broad and 40 cm thick?
8.
Three solid metal cubes with edges 6 cm, 8 cm and 10 cm respectively are melted
together and formed into a single cube. Find the volume of new cube.
9. Find the volume of a cube whose surface area is 150 m2.
10. Find the volume of a cube, one face of which has an area of 81 m2.​

Answer 1

Q. 6

Given,

volume of cube=1000cm^3

total surface area of cube =?

so,

volume of cube=length^3

1000=l^3

l=10cm

total surface area of cube=6l^2

=6(10)^2

=600cm^2

I hope this answer help you