exam Maths Puzzle Numerical Ability

Rubbing alcohol is typically diluted with water to 70% strength. If you need 3.5 oz of 45% rubbing alcohol, how many ounces of 70% rubbing alcohol and how much water should you combine?

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exam Other Question
a mountain climber is scaling a 400-foot cliff.the climber starts the bottom at t=0 and climbs at a constant rate of 124 feet per hour.use the slope and y-intercept to write the li -12=6+2/3y
-12-6=6-6+2/3y
-18=2/3y
(2/3)-18=(2/3)2/3y
-12=y

Is this correct?