Math riddles

3 friends went to buy a clock valued in $ 60 and they contributed $20 each for the clock. Later the shopkeeper discovered that it was of $ 50 only and sent a servant to return them $ 10. The servant unable to divide 10 among the 3, keeps $4 for himself and gives them 2$ each. So now each friends expenditure is $ 18 only 18*3=54 so $ 54 given by the friends and 4 $ are with the servant total = 54+4 = 58.
Where did 2$ go?

Answer

Our mind is thinking just of what each got
rather we should see where the amount goes 18*3=54 is what they spent and 6 is what they were reimbursed so total = 60 money given to the servant gets automatically accounted for, as the shares of friends gets reduced.

Write 1/81 as a repeating decimal. You're in for a surprise!

Answer

0123456789...

What is 5 x 24 x 65 x 6776 x the half of four x 22 x the half of ten x 25678 x 95 x 4022 x the half of eight?

Answer

Zero.

If you drew a eight on a piece of paper, and cut it horizontally you would get 2 zeroes. Anything times zero is zero.