Question

On a workday, the average decibel level of a busy street is 70 db, with 100 cars passing a given point every minute. if the number of cars is reduced to 25 every minute on a weekend, what is the decibel level of the street?

Answer 1

70dB is represented by 100cars in 60sec. Therefore if the number of cats is reduced by 3/4 in the same amount of time(60s), then the decibel level will reduce by 3/4 also. So 70dB * .25= 17.5dB

Answer 2

The average decibel level of the street on a weekend if number of cars is reduced to 25 every minute is 17.5 db

Workday:

Number of cars = 100

Decibel level = 70 db

Weekend:

Number of cars = 25

Decibel level = x

Ratio of number of cars to decibel level

100 : 70 = 25 : x

100/70 = 25/x

cross product

100 × x = 70 × 25

100x = 1750

x = 1750/100

x = 17.5 db

Therefore, the average decibel level of the street on a weekend is 17.5 db

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