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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A field Microphone has a parabolic cross section and is 18 inches deep. The focus is 4 inches from the vertex. Find the width of the microphone. Can you please help me solve: If the sales tax on a $60 purchase is $3.90, What would it be on a $280 purchase?