Questions
The monthly sales for the first 11 months of the year of a certain salesman were Rs. 12,000 but due to his illness during the last month the average sales for the
whole year came down to Rs. 11,375. The value of the sale during the last month was
detailed solution
Correct option is A
Let Rs. x be the sale in the last month. Usingthe formula of combined mean, we have12,000×11+x12=11,375 ∣x=11,375×12−12,000×11 =1,36,500−1,32,000=4500.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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