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Sonia and Saniya can complete a task in 30 days when working together, after Soniya and Saniya have been working together for 11 days.The number of days taken by him to complete the task would have been : 

Kabir was asked to finish testing of an application in 15 days, which is generally completed by him in a span of 20 days. His project manager has asked his colleague, Vikrant to help him in testing the application. This being a new application for Vikarnt, he is only 80% as efficient as Kabie. Working together, they will be able to finish the testing in how many days?

The avg earning of a group of persons is Rs.50 per day. The difference between the highest earning and lowest earning of any two persons of the group is Rs. 45. If these two people are excluded the avg earning of the group decreses by Rs 1. If the minimum earning of the person in the group lies between 42 and 47 and the no.of persons initially in the group was equal to a prime number , with both its digit prime. The no.of persons in the group initially was :