exam Maths Puzzle Numerical Ability

Hi. I need help answering the following question. Thanks in advance.
Sandy has $3.75 in change. She has three more quarters than dimes but twice as many nickels as quarters. Express as an algebraic equation and simplify.

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A book contains 500 pages. If there are 200 typing errors randomly distributed throughout the book, use the Poisson distribution to determine the probability that a page contains e what does the equation y=mx+c mean?