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प्रश्न
Puja is 30% less efficient than Poonam. If Poonam takes 20 days to do a job, how many days would Puja take to do the work.
पर्याय
26 days
`28 4/7` days
`22 1/3` days
Cannot be determined
MCQ
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उत्तर
`28 4/7` days
Explanation:
Ratio of efficiency of Puja : Poonam
= 0.7 : 1 or 7 : 10
Ratio of time of Puja : Poonam = 10 : 7
When poonam takes 20 days, hence 7x
= 20, x = `20/7` and no. of days taken by puja = `(10 * 20)/7`
`= 200/7 = 28 4/7` days
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