Question : Working 12 hours per day, Raj can complete a work in 12 days. How many hours per day he should work to finish the same work in 9 days?
Option 1: 20 hours
Option 2: 24 hours
Option 3: 12 hours
Option 4: 16 hours
Correct Answer: 16 hours
Solution :
We know, H
1
× D
1
= H
2
× D
2
, Where H
1
, H
2
are hours per day and D
1
, D
2
are number of days.
Let the required hours be $x$.
So, 12 × 12 = $x$ × 9
⇒ $x$ = 16
Hence, the correct answer is 16 hours.
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