Where Are Most of the People Employed?

Where are most of the earth's active volcanoes concentrated:

45 people take 18 days to dig a pond. If the pond would have to be dug in 15 days, then the number of people to be employed will be

45 people take 18 days to dig a pond. If the pond would have to be dug in 15 days, then the number of people to be employed will be :

How many educated people are employed ?

How many educated people are employed ?

In the following figure, how many educated people are employed ?