book Maths Puzzle Numerical Ability

The student-teacher ratio for Washington High was reported to be 27.5 to 1. If there are 42 teachers, then how many students are there?

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book Other Question

Please Help me Factor X^2-5X+8^-2=2^-2 It says:

Find the equation of a line passing through the pair of points. Write the equation in the slope-intercept form.

The problem:

(7/6,1) and (-1/3,0)

I'm totally l