Mathematics, 07.04.2020 18:53, yessi1836

A bag contains blue marbles and red marbles, 31 in total. The number of blue marbles is 9 less than 3 times the number of red marbles. How many blue marbles are there?

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A bag contains blue marbles and red marbles, 31 in total. The number of blue marbles is 9 less than...