GRE Exam Numerical Ability Averages

Employee of a company is in either Department X or Department Y. There are twice as many employees in Department X as in Department Y. The average (arithmetic mean) salary is Rs 25,000 for the employees in Department X and is Rs 35,000 for the employees in Department Y ,then what is the average salary of all the employees ?

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GRE Other Question

A man purchases every 11 articles for Rs 10 and sells every 10 articles for Rs 11. How many articles should he sell to gain Rs 63 ? If seven times the seventh term of an AP is equal to eleven times its eleventh term, What is the value of 18th term ?