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# A Cylindrical Jar of Radius 6cm Contains Oil. Iron Sphere Each of Radius 1.5cm Are Immersed in the Oil. How Many Spheres Are Necessary to Raise Level of the Oil by Two Centimetress? - CBSE Class 10 - Mathematics

ConceptVolume of a Combination of Solids

#### Question

A cylindrical jar of radius 6cm contains oil. Iron sphere each of radius 1.5cm are immersed in the oil. How many spheres are necessary to raise level of the oil by two centimetress?

#### Solution

Given that radius of a cylindrical jar(r) = 6cm

Depth/height of cylindrical jar (h) = 2cm

Let no of balls be ‘n’

Volume of a cylinder = πr2h

V1=22/7xx(6)^2xx2cm^3       ..........(1)

So volume of sphere=4/3pir^3

V^2 = 4/3xx22/7(1.5)^3cm^3    .........(2)

Volume of cylindrical jar is equal to sum of volume of n spheres

Equating (1) and (2)

22/7xx(6)^2xx2=nxx4/3xx22/4(1.5)^3

n=(v_1)/(v_2)⇒ n=(22/7xx(6)^2xx2)/(4/3xx22/7(1.5)^3

n = 16

∴ No of spherical balls (n) = 16

Is there an error in this question or solution?

#### APPEARS IN

RD Sharma Solution for 10 Mathematics (2018 to Current)
Chapter 14: Surface Areas and Volumes
Ex. 14.10 | Q: 42 | Page no. 30
Solution A Cylindrical Jar of Radius 6cm Contains Oil. Iron Sphere Each of Radius 1.5cm Are Immersed in the Oil. How Many Spheres Are Necessary to Raise Level of the Oil by Two Centimetress? Concept: Volume of a Combination of Solids.
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