book Maths Puzzle Numerical Ability

I need help with solving this equation, too: -27.23+x=9.77

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A invests $10,000 for 6 monts, B invests $8,000 for 5 months and C invests $5,000 for a year. What is B's share in a total profit of $12,000? A guy wire (a type of support used for example, on radio antennas) is attached to the top of a 50 foot pole and stretched to a point that is d feet from the bottom of the pole. Express the angle of inclination as a function of d.