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The average age of 20 children and their teacher's age are 18 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?
The average of 25 numbers is 39.4. The average of the first 12 numbers is 36.5, and the average of the last 12 numbers is 40.5. Determine the value of t...
The average mark obtained by 110 candidates in a certain examination is 45. If the average marks of passed candidates are 50 and that of the failed cand...
A number is such that when it is multiplied by 5, it gives another number which is as much above from 270 as the original number (itself) is below 270. ...
The average score obtained by 25 students in a class test is 68 marks. The top place was shared by 3 people who got the same score. If the lowest score ...
In a school with 400 students, the average of the age of the boys is 16 years and that of the girls is 12 years. If the average age of the school is 14 ...
The average score obtained by 26 students in a class test is 68 marks. The top place was shared by 3 people who got the same score. If the lowest score ...
The average of 18 numbers is 75. The average of the first nine numbers and the last six numbers is 62.5 and 82.5, respectively. T...
The average age of 12 girls is 35 years. If the age of two more girl is added the average decreases by one and a half year. What is the sum of the age o...
The average of the first six numbers is four times the average of the next three numbers. If the average of all nine numbers is 24, then find the sum of...