book Maths Puzzle Numerical Ability

Nozomi drinks 2 cups of coffee each morning. Each cup contains 140 milligrams of caffiene. The human body can metabolize about 12% of any caffiene remaining in the blood stream ea

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3(x+y)^2+4(x+y)-6, when x= 4, and y = -1 Identify the base in the statement "50% of 300 is 150."

This made no sence to me can someone help me solve it