What will be the Hours a Day? If

15 man take 20 days to complete a job working 8 hours a day. The number of hours a day should 20 men take to complete the job in 12 days

  1. 5 hours
  2. 10 hours
  3. 15 hours
  4. 18 hours
Manish Listener Asked on 14th July 2015 in Maths.
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1 Answer(s)

Answer: (2) 10 hrs.
Explanation:-
Formula –
M1 H1 D1 = M2 H2 D2
Where, M – Number of men, H – number of hours   & D – number of days.

Here, M1 =   15, H1 = 8, D1 = 20
And  M2 = 20, D2 = 12   & H1 = ?
Put these values in formula,
15 x 8 x 20 = 20 x 12 x H2
H2 = 2400/240
H2 = 10 hrs.
Hence, the answer is (2) 10 hrs.

Anurag Mishra Professor Answered on 18th July 2015.
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