The average age of M boys is ‘b’ years and of ‘n’ girls ‘c’ years. The average age of all together is_________?

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Visitors to show were charged Rs.15 each on the first day. Rs.7.50 on the second day, Rs.2.50 on the third day and total attendance on the three days were in ratio 2:5:13 respectively. The average charge per person for the whole show is___________?

A. Rs.3 B. Rs.4.50 C. Rs.5.00 D. Rs.7.50...

A building contractor employs 20 male, 15 female and 5 child workers. To a male worker he pays Rs.25 per day, to a female worker Rs.20 per day and a child worker Rs.8 per day. The average wage per day paid by the contractor is__________?

A. Rs.20 B. Rs.21 C. Rs.22 D. Rs.23...

A student scored an average of 80 marks in 3 subjects: Physics, Chemistry and Mathematics. If the average marks in Physics and Mathematics is 90 and that in Physics and Chemistry is 70, what are the marks in Physics?

A. 60 B. 64 C. 72 D. 80...

A family consists of grandparents, parents and three grandchildren. The average age of the grandparents is 67 years, that of the parents is 35 years and that of the grandchildren is 6 years. What is the average age of the family?

A. 28 4/7 years B. 31 5/7 years C. 32 1/7 years D. None of these...

The average of 18 observations was calculated and it was 124. Later on it was discovered that two observations 46 and 82 were incorrect. The correct values are 64 and 28. The correct average of 18 observations is___________?

A. 123 B. 137 C. 121 D. 122...