if 4 typists work 6 hour a day, they can type a book in 20 days. how many days will 2 typists take to do the same job, if each works for 8 hours a day?
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Step-by-step explanation:
m1*d1*h1 = m2*d2*h2
m1=4, d1=20, h1=6; m2=2, d2=d, h2=8
4×20×6 = 2×8×d
d = 20×4×6/2×8 = 30 days
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