Total work = 12 units
Efficiency of A+B = 12/12 = 1 unit
Efficiency of A = 2/3 units
Efficiency of B = 1/3 units
Efficiency of A+B+C = 12/6 = 2 units
Efficiency of C = 1unit
Time taken by C = 12
R + 8 = 12
R = 4
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100 Questions
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60 Mins English English35 Questions35 Marks20 Mins English English35 Questions35 Marks20 Mins EnglishX alone can complete a work in 56 days and Y alone can do it in 72 days. both completed in:
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