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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Solve by addition state if it is inconsistent or dependent
1/3x - 1/2y = 5/6

1/2x - 2/5y = 9/10

I don't know where to begin on this problem. The highest point in Florida is 345 feet above sea level. A viewer whose eyes are at 5 feet above the ground is standing at this point. The formula d=v1.5h can be used to estimate