The average age of 9 students and their teacher is 16 years.The average age of the first four students is 19 years and that of the last five is 10 years. The teacher's age is
The average age of 9 students and their teacher is 16 years.The average age of the first four students is 19 years and that of the last five is 10 years. The teacher's age is
1). 36 years
2). 34 years
3). 30 years
4). 28 years
SSC CGL Books
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Other Questions
1. A man bought 13 articles at Rs 70 each. 15 at Rs 60 each and 12 at Rs 65 each. The average price per article is
2. The average age of an adult class is 42 years. 12 new students with an average age of 30 years join the class, thereby decreasing the average by 8 years. The original strength of the class was
3. A cricketer whose bowling average is 24.85,runs per wicket,takes 5 wickets for 52 runs and thereby decreases his average by 0.85. The number of wickets taken by him till the last match was :
4. The average of 8 numbers is 20.The average of first two numbers is $15\frac{1}{2}$ and that of the next three is $21\frac{1}{3}$.If the sixth number be less than the seventh and eighth numbers by 4 and 7 respectively, then the eighth number is :
5. The mean of 100 items was found to be 30. If at the time of calculation, two items were wrongly taken as 32 and 12 instead of 23 and 11, the correct mean is:
6. Mean of 10 numbers is 30. Later on It was observed that numbers 15,23 are wrongly taken as 51,32. The correct mean is
7. Find the mean of the first 6 prime numbers?
8. Out of four numbers, the average of the first three is 18 and that of the last three is 16. If the last number is 19,the first is
9. 3 numbers whose average is 112, the first number is 1/6th the sum of other 2. What is the first number?
10. In a family of 5 members, the average age at present is 33 years. The youngest member is 9 years old. The average age of the family just before the birth of the youngest member was
