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Question
In a factory there are 3 machines to perform a job. The newest machine can do the job in 3 days, another machine can do it in 4 days, and the third machine can do it in 6 days. How many days will the factory take to do the job using all three machines together?
1.333
4.333
6
13
None of these
ANSWER : 1
Descrption
<p>All three of the machines together can complete (1/3 + 1/4 + 1/6) = 3/4 part of the job in a day.</p> <p>Those machines can complete 3/4 part of the job in 1 day.</p> <p>So, the machines can complete the whole job in 1/(3/4) = 4/3 = <strong>1.333 day.</strong> </p>
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