exam Maths Puzzle Numerical Ability

6x+9/3

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A radiator holds 4 gallons of fluid. If it is fullwith a 20% solution how muchfluid should be drained and replaced with a 70% antifreeze mixture to result in a 50% mixture of antifreeze? The cost of a fish dinner to the owner of the Golden Wharf restaurant is $7.95, the fish dinner is sold for $11.95. Find the percent markup?