Question

ali 7 typists typing 7 hours a day (at equal speed) can type the manuscript of a book in 9 days, then how
many days will 3 typists typing 3 hours a day take in typing the manuscript of the book?​

Answer 1

Step-by-step explanation:

no. of days(×hours per day) d, and men to do a particular work are inversely proportional

so m1xd1xh1=m2xd2xh2

7×7×9 = 3x3xd2

d2=49

49 days