Question

Practice Set 16.1
1. Find the volume of a box if its length, breadth and height are 20 cm, 10.5 cm and
8 cm respectively.

2.A cuboid shape soap bar has volume 150 ce. Find its thickness if its length is
10 cm and breadth is 5 cm.

3. How many bricks of length 25 cm, breadth 15 cm and height 10 cm are required
to build a wall of length 6 m, height 2.5 m and breadth 0.5 m?​

Answer 1

Answer:

1)ans÷ 1680 cm3

2)ans÷3cm

3)ans÷ 2000 bricks

Explanation:

Q1)ans÷ Given,

length,l= 20cm, breadth,b=10.5cm, height,h= 8cm

Then,

Volume of a box = l × b × h

= 20× 10.5× 8

= 1680cm3

Q2)ans÷ Given,

volume of a box=150

length,l = 10cm

breadth, b = 5cm

To find: Thickness

Then,

Volume of a box=l×b×h

150= 10×5×h

h= 150/10×5

=150/50

=3cm

Q3)ans÷ Given,

length of brick= 25cm

breadth of brick = 15cm

height of brick= 10cm

then, volume of brick= l×b×h

= 25×15×10

=3750cm3

Now, length of wall= 6m =6×100cm=600cm [1m=100cm]

breadth of wall =0.5m= 0.5×100=50cm

height of wall=2.5m=2.5×100=250cm

then, volume of wall=l×b×h

= 600×50×250

=7500000 cm3

Therefore, the number of bricks required

=7500000 cm

3750 cm

=2000 bricks.