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.
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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
Step-by-step explanation:
number of boys2x-5=23 2x=23+5 2x=28 X=28/2=14+23=
total student of class=37