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What values of c and d make the equation true?

Students are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. there are 15 questions on the test, and students are given 51 minutes to take it. how many multiple-choice questions are on the test?

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.