defence exam BSF Constable (Tradesmen) 2023 Mock Test Quantitative Aptitude Time and Work Work Efficiency
If 9 persons can do a job in 18 days, then 18 persons with twice the efficiency can do the same job in:
1
\(\frac{9}{2}\) days
2
\(\frac{5}{2}\) days
3
\(\frac{11}{2}\) days
4
\(\frac{7}{2}\) days