Question 27

In a school, the bell is rung once after each half an hour. The school starts at 8:00 a.m. and closes at 1:30 p.m. The bell is rung 3 times continuously, at the time of beginning, at the time of lunch break at 10:00 and 10:30 a.m. and at the end. How many times is the bell rung every day ?

Solution

The bell rings 3 times at beginning of school, at the end of school and at beginning of lunch and at the end of lunch so that makes up 12 gongs.

Then it rings after every half an hour .

8.30 9.00 9:30 = 3 times

(We have already counted the bell at 10.00 and 10.30 for lunch )

11.00 11.30 12.00 12.30=5 times

So total 12+3+5=20 times

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