Rajan does \(\frac{7}{11}\) of a work in 21 days. How many more days will he take to complete the work?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 12
Working at a steady rate, the time taken is proportional to the part of the work done.
Work left \(=1-\frac{7}{11}=\frac{4}{11}\)
\(\frac{7}{11}\) of the work takes 21 days, so \(\frac{1}{11}\) of it takes \(\frac{21}{7}=3\) days
\(\frac{4}{11}\) of the work takes \(4\times3=12\) days