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# How Many Spherical Bullets Each of 5cm in Diameter Can Be Cast from a Rectangular Block of Metal 11 Dm X 1m X 5 Dm? - CBSE Class 10 - Mathematics

ConceptVolume of a Combination of Solids

#### Question

How many spherical bullets each of 5cm in diameter can be cast from a rectangular block of metal 11 dm x 1m x 5 dm?

#### Solution

Given that a metallic block which is rectangular of diameter 11dm x 1m x 5dm

Given that diameter of each bullet is 5cm

Volume of sphere =4/3pir^2

Dimensions of rectangular block = 11dm x 1m x 5dm

Since we know that 1dm =10-1 m

11x10-1x1x5x10-2m3              ………(1)

Diameter of each bullet = 5cm

Radius of bullet (r)=d/2=5/2=2.5cm

=25x10-2m

So volume=4/3pi(25xx10^-2)^3

Volume of rectangular block should be equal sum of volumes of n spherical

bulletsLet no of bullets be ‘n’

Equating (1) and (2)

55x10-2=n=4/3pi(25xx10^-2)^3

(55xx10^-2)/(4/3xx22/7(25xx10^-2)^3)=n

n=8400

∴ No of bullets found were 8400

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#### APPEARS IN

RD Sharma Solution for 10 Mathematics (2018 to Current)
Chapter 14: Surface Areas and Volumes
Ex. 14.10 | Q: 2 | Page no. 27
Solution How Many Spherical Bullets Each of 5cm in Diameter Can Be Cast from a Rectangular Block of Metal 11 Dm X 1m X 5 Dm? Concept: Volume of a Combination of Solids.
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