exam Maths Puzzle Numerical Ability

The reciprocal of a number plus the reciprocal of twice the number equals 3/10. Find the number.

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exam Other Question

What is the slope of the line described by this equation: P = 3 - (1/6)Q? The variable P is plotted on the vertical axis, and the variable Q is plotted on the horizontal axis. Asking for help on factoring this
9x(x-7y)-6(x-7y)
thanks ahead of time, I appreciate the help