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this was a question in class 10 maths paper for st georges school-alaknanda

Q. A 15 cm long test tube having diameter of 3.6 cm has water
upto a height of 6 cm. 20 spherical drops of oil of radius 9 mm are dropped
into it. What length of test tube
remains empty?.............tell me the solution to this problem or where the solution exists....
someone with brains can do it....


Diameter of the tube=3.6cm
total height=15cm=150mm
let height upto water=L=6cm=60mm
volume of 20 oil drops=20×(4/3)πr³
⇒remaining height=15-(6+6)cm
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