Total expenses of a boarding house are partly fixed and partly varying linearly with the number of boarders. The average…

3 years age, the average age of a family of 5 members was 17 years. A baby having been born, the average age of the fami…

The average of x<sub>1</sub>, x<sub>2</sub>, x<sub>3</sub> and x<sub>4</su…

The average price of three items of furniture is Rs. 15000. If their prices are in the ratio 3 : 5 : 7, the price of th…

The average of runs scored by a cricketer in his 99 innings is 99. How many runs will he have to score to his 100th inni…

The average marks of a student in 8 subjects is 87. Of these, the highest marks are 2 more than the one next in value. I…

A batsman makes a score of 270 runs in the 87<sup>th</sup> inning and thus increase his average by a certain…

The average age of P, Q and R is 15 years more than R's age. If the total age of P and Q together is 39 years, then R's …