JEE Main 2015 (Online) 10th AprilQuestion 1
A factory is operating in two shifts, day and night, with $70$ and $30$ workers, respectively. If per day mean wage of the day shift workers is Rs. $54$ and per day mean wage of all the workers is Rs. $60$, then per day mean wage of the night shift workers (in Rs.) is :
Statistics
Solution
Total wages $=100\cdot60=6000$; day shift $=70\cdot54=3780$; night mean $=\frac{2220}{30}=74$.