The average age of 30 students of a class is 15 years. A 20-year-old student left the class and replaced by two new students, whose age difference is 5 years. If the average age of all students is 15 years, then what will be ratio of young student to elder students.

The average age of 30 students of a class is 15 years. A 20-year-old s

1.	The average age of 30 students of a class is 15 years. A 20-year-old student left the class and replaced by two new students, whose age difference is 5 years. If the average age of all students is 15 years, then what will be ratio of young student to elder students.
A.	4 :5
B.	3:5
C.	3:4
D.	4:3
Answer» D. 4:3

Discussion

No Comment Found

Related MCQs

A mathematics teacher calculated the total marks obtained by 35 students of 8th class . The average marks of the students were 72. But 36 marks for Reena was calculated in place of 86 obtained by her. What was the correct average of all the students?
A batsman scores 98 run in the 17th match of his career. His average runs per match increased by 2.5. What is his average before the 17th match?
The average of nine numbers is 50. The average of first five numbers is 54 and that of the last three numbers is 52, then the sixth number is -
A cricketer's average score in 10 innings was 36. In his 11th innings, he scored some runs because of which his average increased to 40. What was his score in 11th innings?
The average of the marks obtained in an examination by 8 students was 51 and by 9 other students was 68. The average marks of all 17 students was:
The average of 3 numbers is 7 and average of first two numbers is 4. what is the third number?
Average of 21 number is 36. If the average of first 12 numbers is 15, then find the average of remaining 9 number?
The average age of 6 members of a family is 25 years. If the youngest member of the family is 15 years, old then what was the average age (in years) of the family at the time of the birth of the youngest members?
The average of 5 consecutive integers starting with M is K . What is the average of 6 consecutive integers stating with (m+1)?
If 30 females from each park are above 80 years age then find the average of no. of females who are below or equal to the age of 80 years from all the parks.

The average age of 30 students of a class is 15 years. A 20-year-old student left the class and replaced by two new students, whose age difference is 5 years. If the average age of all students is 15 years, then what will be ratio of young student to elder students.

Discussion

No Comment Found

Related MCQs

Reply to Comment