A website Maths Puzzle Numerical Ability Area and Volume

A vessel in the shape of a
hemisphere contains 75ltr of water.How many litr of water contain in another vessel which the radius is 3 times of the 1st vessel?

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A website Other Question
If
5+5=0
6+6=2
7+7=4
then
8+8=? A card is drown from a pack & replaced 260 times.Find the probability of obtaining queen of hearts 4 times.