exam Maths Puzzle Numerical Ability

What is 75% of 200?

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How can I Find the slope of the line passing through the points (-2, 1) and (3, 9). and show in a graph? thank you in advance for your help ok i am in Algebra A and i am doing weighted averages. the problem is: An alloy of metals is 25% copper.Another alloy is 50% copper. how much of each alloy should be used to make 1000 grams of an alloy that is 45% copper?