exam Maths Puzzle Numerical Ability

Grandpa started to give nickels to his grandchildren any time he sa them. So far, Sharon has 3 times as many as Jennifer, Sharon has twice as many as Brian, and Michelle has only

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-4(x-3)+x=-2x-3/4 Please HELP HELP!!! Please help explain and show what is the decibel level of a normal conversation,(square root of 10)- 3.2 x watt per meter^2?