Question

a solid rectangular piece of metal measures 3 M long 1.5 m wide and 3 cm thick. Find the weight of this piece if a cubic centimetre of the metal weighs 7 g.

Answer 1

Given
We have a rectangular piece of metal

Or we can say cuboid who's dimensions are

L=3m=>300cm (1m=100cm)
B=1.5m =>150cm
H=3cm

Volume of cuboid piece=lxbxh

=300x150x3

=135000cm³

1cm³ weight =7g

Then weight of 135000cm³=135000x7

=945000g

=945kg (1kg =1000g)

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Answer 2

Length = 3m =300cm
Breadth= 1.5m = 150cm
Height = 3cm

Volume of cuboid = LBH
=300*150*3
=135000cm cube

1cm cube = 7g
135000cm cube = 135000*7g
=945000g