Arrangement of tables & chairs in an exam hall done by 10 workers in 6 hours? How many workers will be required to do the same work in 4hrs?

17 Mr X is making a wheel using spokes. He wants to fix equal spokes in such a way that the angles between any pair of convective spokes are equal. Help him by completing the following table. 18 The cost of 5 litres of a milk is Rs55. Tabulate the cost of 2, 4, 10 and litres of milk 20 5 pipes are required to fill a petrol tank in 2 hour 20 minutes. How long will it take if only 4 pipes of the same type are used?  1

If truck covers a distance of 510 km in 34 litres of diesel. How much distance would it cover in 20 litres of diesel?