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How many times did the clock at home strike for the math problem in the third grade of primary school? How many times does it knock every half hour?
Answer: When and how many times have you knocked? 1+2+3+4+5+6+7+8+9+ 10+ 1+ 12 = 78.

Knock every half hour 1x 12= 12.

Total 78+ 12=90

The clock goes twice a day 90x2= 180.