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Find the total number of ways of answering five objective type questions, each question having four choices

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Find the total number of ways of answering 5 objective type questions, each question having 4 choices.

A question bank has questions of Physics and Chemistry. The number of questions of Chemistry are 3.5 times the number of questions of Physics. If there are 90 questions in the question , bank find the number of questions of Physics and Chemistry in the question bank .