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S, M, E and F are working in shifts in a term to finish a project. M works with twice the efficiency of others but for half as many days as E worked. S and M have 6 hour shifts in a day, where E and F have 12 hours shifts. What is the ratio of contribution of M to contribution of E in the project?       

      (a) 1:1                                                                 (b) 1:2

      (c) 1:4                                                                 (d) 2:1

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