Question

At residential area sector 22, if 500 crackers were burnt to produce 80 db of noise
pollution. How many crackers they should burst so that only 50 db of noise
pollution is created?

Answer 1

Given :

Number of crackers to produced 80 db of noise = 500

To Find :

Number of crackers to produced 50 db of noise

Solution :

Let The Number of crackers to produced 50 db of noise = n

Applying unitary method

∵ Number of crackers to produced 80 db of noise = 500

Or, Number of crackers to produced 1 db of noise = $\dfrac{500}{80}$

∴ Number of crackers to produced 50 db of noise = $\dfrac{500}{80}$ × 50

Or,                                                                             n = 4 × 50

i.e                                                                             n = 200

Hence, The Number of crackers to produced 50 db of noise is 200 . Answer

Answer 2

Noise of crackers to be produced=50db of noise

To find

No of crackers produced in 50db of noise

Solution

Refer to the image above