Question

metallic cube of side 10 m is melted and formed into a cuboid of length 20 m and breadth 10 m. Find

the height of the cuboid formed.




b) The number of boys in a class is 5 less than twice the number of girls in the class. If the total number of

boys is 23, find the total number of student in the class.​

Answer 1

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Answer:

5 cm

Step-by-step explanation:

Volume of Cube = Side³

                           = (10 cm)³

                           = 1000 cm³    ...(1.)

This is melted and cast into the Cuboid. The Volume of Cuboid so made will be equal to the Volume of the Cube.

Let the height of the cuboid be h cm.

Then,

Volume of Cuboid = l × b × h

                              = 20 × 10 × h

                              = 200h      ...(2.)

Equating (1.) and (2.),

We have 200h = 1000

                     h = 1000/200

                     h = 5

Hence, the height of the cuboid is 5cm

Answer 2

Step-by-step explanation:

number of boys2x-5=23 2x=23+5 2x=28 X=28/2=14+23=

total student of class=37