Elitmus Exam Numerical Ability Area and Volume

A duster is of dimension 5*5*7 is sinked into a cylindrical vessel of radius 5 cm and height 10 cm .After insertion the level of the water is inccresed by 2.14 cm ..Then by what percentage the part of the duster is above/below(something like that) the layer?

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Elitmus Other Question

find the probability of x^2-1 divisible by 72 condition is x>=10.
options:
a) Never
b) 1/6
c) 1/5
d) 1/9
obama can build a wall in 21 months and osama can destroy in 28 months,they worked alternately .in how many days they will complete the work?
a)161b)168c)167d)163