Question

24 A tea packet measures 10cm x 6cm x 4 cm. How many such tea packets can be placed in a cardboard box of dimension 5m x 0.3m x 0.2m?

25 The radius of the base of a cylindrical water drum open at top is 70 cm and height 1.3 m. Find the surface area of the water drum? Also find capacity of drum in litres?​

Answer 1

Answer:

The answer to first question is 1250 number of packets.

Step-by-step explanation:

24. We can calculate it by getting the volume of bothe the packets and cardboard box.

Volume if the cardboard box us given by

5m×0.3m×0.2m

=500cm×30cm×20cm

=300000cm^3

And the volume of each individual packet is

10cm×6cm×4cm

=240cm^3

Number of packet which can be placed in the box is

300000/240

=1250 nos

25. Here the given data is

Radius of the base = 70cm =0.7m

Height of Cylinder = 1.3 m

So surface area of water drum =

2π×radius×height +2πradius^2

= 2*3.14*0.7*1.3 + 2*3.14*0.7*0.7

=5.7148 m^2 + 3.0772m^2

=8.792 m^2

Volume of the cylindrical water drum is

πradius^2*height

=3.14*0.7*0.7*1.3

=2m^3

We know that 1m^3 volume of space can hold 1000 ltr of water.

So the capacity of water which can be held inside the cylindrical drum is 2000litres.