exam Maths Puzzle Numerical Ability

I need the correct procedure to resolve the equation

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exam Other Question

How many cups of party mix that is 64% pretzels must be added to 84 cups of a party mix that is 43% pretzels to make a party that is 50% pretzles? Two dice are rolled. Find the probability of getting a sum greater than 8

Is it 0, 13/36, 2/9, 5/18.

Can you tell me how to work this out?

Thank you, Ellen