book Maths Puzzle Numerical Ability

Ms. Jordan has been given a loan of $2500 for 1 year. If
the interest charged is $275, what is the interest rate on the loan?

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In any triangle, the sum of the measures of the angles is 180 degrees. In triangle ABC angle A is four times as large as angle B. angle C measures 0 degrees less than angle B. Find the measures of each angle.

ThAnKiEs! Hi
I'm really stuck on this problem. Someone please help me solve it because i have this assignment due soon. Thanks
Write the fraction as a sum of terms.
{x^2-4x+2/x}. I don't