self Exam Numerical Ability

Q. The arithmetic mean of 100 observations is 24.6 is added to then each of them is multiplied by2.5. Find the new arithmetic mean.

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self Other Question

Q. There are 99 birds on the roof.
suddenly all birds fly away.
some birds fly to east.
birds fly to west is twice of that of east.
birds fly to north is twice of that of west.
Birds flies to south is same as in north.
Find the no. of birds fly in all diections. Q. Given the sequence a, bb, ccc, dddd, eeeee....... and so on, find the 240th term of the sequence?