The average of five numbers is 56. If theaverage of first four numbers is 54, what isthe value of the fifth number ?
Ram’s present age is three times his son’s present age and two-fifth of his father’s present age. The average of the present ages of all of them is 46 years. What is the difference between the Ram’s son’s present age and Ram’s father’s present age ?
The average age of seven boys sitting in arow facing North is 26 years. If the average age of first three boys is 19 years and the average age of last three boys is 32 years,what is the age of the boy who is sitting in middle of the row ?
The average age of 80 boys in a class is 15 years. The average age of a group of 15 boys in the class is 16 years and the average age of another 25 boys in the class is 14 years.What is the average age of the remaining boys in the class ?
The total marks obtained by a student in Physics, Chemistry and Mathematics together is 120 more than the marks obtained by him in Chemistry. What are the average marks obtained by him in Physics and Mathematics together ?
The average of 5 numbers is 65. The average of the first two numbers is 81 and the average of the last two numbers is 38. What is the third number ?
The average age of the family of five members is 24. If the present age of youngest member is 8 years, then what was the average age of the family at the time of the birth of the youngest member ?
