Questions
The average salary of male employees in a firm was Rs.520 and that of females was Rs.420. The mean salary of all the employees was Rs.500. The percentage of male employees is
detailed solution
Correct option is A
Since,x¯1=520,x¯2=420 and x¯=500Also we know x¯=n1x¯1+n2x¯2n1+n2⇒ 500n1+n2=520n1+420n2⇒ 20n1=80n2⇒ n1:n2=4:1Hence, the percentage of male employees in the firm=44+1×100=80%Talk to our academic expert!
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An automobile driver travels from a plain to a hill station 120 km away at an average speed of 30 km per hour. He then makes the return trip at an average speed of 25 km per hour. He covers another 120 km on the plain at an average speed of 50 km per hour. His average speed (in km/hr) over the entire distance of 360 km will be
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