exam Maths Puzzle Numerical Ability

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Anne has two solutions, one with 6% iron and one with 2% iron. How many liters of each solution should be mixed to create 16 liters of a solution with 3% iron content?

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Graph the following equations. Calculate the slope, x-intercept and y-intercept, and label the intercepts on the graph.

2x + 3y = 9 a painting contractor planning to paint a 15'x 8'x 10' room. The room has a 4'x 2' window and a 3x 8' dooe that will not be painted. One gallon of the paint covers 500 square feet.