Question

12 people can build the wall in 20 hour.How many people will be required to build the same wall in 15 hourrs

Answer 1

Time taken by 12 people to build a wall=20 hours

Time taken by 1 people to build a wall=20/12=1.6hour

1.6 hour taken =1 people

15 hour taken=1.6x15 =0.936