Others Maths Puzzle Numerical Ability Clocks and Calendars

Q. How many minutes a watch lose for a day, if its two hands coincide for every 64 minutes?

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Q. If arithmetic mean of six numbers is 4.5. What is the sum of these numbers Q. A contractor undertakes to build a wall in 50 days.He employs 50 men for the same. However,after 25 days he finds that the work is only 40% complete. How many more men need to be employed to complete the work 10 days before time?