1.

Smita can finish a work in 12 days and Sam can finish the same work in 9 days.After working together for 4 days they both leave the job. What is the fraction of unfinished work?1). 1/22). 7/93). 2/94). 1/4

Answer»

WORK DONE by Smita in one day = 1/12

Work done by Sam in one day = 1/9

Work done by Smita and Sam TOGETHER in one day = (1/12) + (1/9) = 7/36

Work done by Smita and Sam together in 4 days = 4 × 7/36 = 7/9

The fraction of unfinished work = 1 – 7/9 = 2/9

∴ The fraction of unfinished work = 2/9


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