Question

Average noise of 30 students in a class is l db. How many more students should be added so that average noise will increase by 10 db.

Answer 1

Answer:if 30 students make 1db noise then 300 students will 10 db noise

therefore 270 more students must be added to existing students

Explanation:hope it helps

Answer 2

Answer:

The answer is 270 students.

Explanation:

from the question,

noise made by 30 students = 1 db

to find how many students should be added to create 10 db

                                 1 db = 30 students

                               10 db = 10 × 30

                                         = 300 students                                                                                                                

No. of   students to be added to create 10 db   = 300 - 30 =270

                                                                              = 270 students