The noise level in a classroom in absence of the teacher is 50 dB when 50 students are present. Assuming that on the average each student outputs same sound energy per second, what will be the noise level if the number of students is increased to 100 ?

In the entrance examination of IIMs, there were 200 questions, each of which carried the same marks. A correct answer gets 2 marks and there is 100% negative marking. A total of 70 candidates took the exam and it was later found that the average marks obtained by these 70 candidates was 240. The candidates were not required to attempt all the questions. None of the candidates got more number of incorrect answers than correct answers. When the scores of the top four students are deleted, the average score of the remaining 66 students falls by 6 marks. Assume that it is possible for two or more students to have the same net score. What is the minimum score possible for the fourth ranking student if no student got a net score of more then 352?

The average marks obtained by 100 candidates in an examinatiion are 45. If the average marks of the passed students are 50 while the average marks of the failed students is 40. Then find the number of students who passes the examination.

Direction: There are 1250 total students in 5 different classes in a school. The number of students in class I is 50 less than the number of students in class II. The number of class IV students is 50 more than the number of students in class II. The average number of students in class III and class V is 250. The number of students in class III is 10% less than the number of students in class I. The number of students of class V is what percent of the total number of students?

In a hostel mess, 50 kg rice are consumed every day. If each student gets 400 gm of rice per day, find the number of students who take meals in the hostel mess.

In a hostel mess, 50 kg rice are consumed every day. If each student gets 400 gm of rice per day, find the number of students who take meals in the hostel mess.

If the sound level in a room is increased from 50 dB to 60 dB, by what factor is the pressure amplitude increased ?