Google Company Numerical Ability Age Problem

A water tank is hemispherical at the bottom and cylindrical at the top. If its radius is 12 m and capacity is 3312π cubic metres, height of the cylindrical portion will be ___ meters.

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Google Other Question
If there is a N sorted array then what is time complexity of finding 2 numbers with sum less than 1000.
A) O(1) B) O(n^2) C) O(n) D) O(logn) 60 men can build a wall in 30 days, but they decide to begin the work together. 55 men quit after the first 10 days. So time needed to build the wall is ____ days.