exam Maths Puzzle Numerical Ability

To form a 10% copper alloy weighing 75 grams, a 6% copper alloy is combined with an 18% copper alloy. How much of each type should be used?

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exam Other Question

Can someone out there help me solve this problem?

I need to find the median of the following set of numbers:

4,5,6,9,11

Thank you,
Sher Given two six sided dice, compute the probability of rolling a nine.