exam Maths Puzzle Numerical Ability

If you have a bucket of water at 10 degree Fahrenheit and another at 10 degree Celsius and drop a 50 cents coin to each, which coin will be the first to reach the bottom of the bucket?

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Could you please take the time to help me solve this problem: Using Geometric Approach, maximize P = 10 x + 2 y, subject to the constraints x > 0, y > 0,
x + 2 y > 4, and x - 2 y
how do you cross multiply when there is a variable in the equation