Decibel is directly proportional to number of cars passing the point. That is,
69 db ----- 139 cars
x db ----- 17 cars
x = number of cars passing the point per minute on a weekend.
Then,
x= (69*17)/139 = 8.43 db ≈ 8 db
The answer is d. All ratios on the chart divide out to 3.5 as d does the same
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Take 18 from both sides by dividing 18 on each side canceling it on the left the divide 72 into 18 and you get 4.
