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In a shopping mall with a staff of 5 members the average age is 45 years. After 5 years a person joined them and the average age is again…

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A car traveled 462 miles per tankful of gasoline on the highway and 336 miles per tankful of gasoline in the city. If the car traveled 6…

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In an office, 40% of the workers have at least 5 years of service, and a total of 16 workers have at least 10 years of service. If 90…

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A certain college has a student-to-teacher ratio of 11 : 1. The average (arithmetic mean) annual salary for teachers is Rs.26000. If the…

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