exam Maths Puzzle Numerical Ability

How many gallons of a 40% alcohol solution must be mixed with 70 gallons of a 21% slution to obtain a solution that is 30% alcohol

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if y varies inversely as x^2 and y=2 when x=4, what is the constant of variation? George weighs 60 lbs. more than 1/2 his younger brother Galen's weight. If their weights balance when George is 4 ft. from the fulcrum on a 10ft. long teeterboard, what are their w