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Persons working in cement plants and lime stone quarries are prone to disease like
In a class of 60 students, 20 students like Math, 25 students like English and 30 students like Science. If 5 Students like both Math and Science, 8 Students like both English and Science and 3 students like neither of these subjects, how many students like all of the three subjects?
What is defined as the reduction of the value of certain natural resources such as mines, oil, timber, quarries, etc. due to the gradual extraction of its contents?
Two men and women are entrusted with a task. The second man needs three hours more to cope up with the job than the second man and the woman would need working together. The first man, working alone, would need as much time as second man and the woman working together. The first man working alone, would spend eight hours less than the double period of the time second man would spend working alone. How much time would the two men and the women need to complete the task if they all asked together?
For testing compressive and tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of
If 6 persons working 8 hours a day earn a day earn Tk. 8400 per week,then 9 persons working 6 hours a day will earn per week----
50 persons can do a work in 12 day's by working 8 hours a day. Working how many hours per day can 60 persons finish the work in 16 days?
39 persons can repair a road in 12 days , working 5 hours a day. In how many day will 30 persons, working 6 hours a day. complete the work?
Fusion of limestone and __________ produces high alumina cement.
Production of one ton of cement requires about __________ tons of limestone.