self Maths Puzzle

If 9 men working 71/2 hours a day can finish a piece of work in 20days, then how many days will be taken by 12 men, working 6 hours a day to finish the work? It is being given that 2 men of latter type work as much as 3 men of the former type?

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self Other Question

Write a program to Convert Binary number to decimal Number?
Hint: 1101 to 13
A well with 14 m inside diameter is dug 10 m deep. Earth taken out ofit, has been evenly spread all around it to a width of 21m to form an embankment. The height (in metres) of the embankment is: