exam Maths Puzzle Numerical Ability

i need help on solving 6x - 3 = 11

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exam Other Question

1.Find the value of 20x when x=10?

2.find the value of 3a when a=-4?

3.find the value of 11(a+b) when a=7 and b=3?
At a distance of 10 meters from a rock band the intensity of sound is approximately 0.1 watt per square meter. Find the intensity in decibels.