book Maths Puzzle Numerical Ability

I had 3 1/2 lb... of trial mix and I ate 1/3 of a pound two days in a row. How much trial mix did I have left?

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book Other Question

How do you factor one side of the equation completely and find the x-intercepts and y-intercepts for y= -8x2 + x ? Find the equation of the line through the point (4, -2) and perpendicular to the line 3x - 5y = 10. Please help me with this one. Thank you.