Gate Exam

In a row of 40 student , R is 11 from the right end and there are 15 student between R and M. what is M's position from the left end of the row. ?

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Gate Other Question

Five people A,B,C,D and E do a certain job . A, B and C together complete the job in 7.5 hrs ; A, C and E together complete it in 5 hrs; A, C and D together complete it in 6 hrs; B, D, and E together comple it in 4 hrs. If all te five people work together then how much time will be required to complete the job the sum of the series 1+ 1.3/6 + 1.3.5/6.8 + ... to infinity