Infosys Company Numerical Ability Clocks and Calendars

A wall clock loses 10 minutes every 1 hour. In 1 hour as per the wall clock , a table clock gets 10 minutes ahead of it. In 1 hour as per the table clock an alarm clock falls 5 minutes behind it. In 1 hour as per the alarm clock, a wristwatch gets 5 minutes ahead it. At noon, all 4 timepieces were set correctly. To the nearest minutes, what time will the wrist show when the correct time is 6 p.m. on the same day ?

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Jhon's family is such that each boy in this family has as many sisters as brothers. And each girl has twice as many brothers as sisters. Find the number of boys and number of girls in Jhon's family. An accountant divides the total by 7 instead of multiplying it by 9. What is the percentage of error that creeps into the value?