Let M be the number of miles Mona biked on Monday.
Thus, Mona biked 2M miles on Saturday.
In all, Mona biked M + 2M + 12 = 30 miles.
Thus, on Monday and Saturday, she biked M + 2M = 3M = 30 - 12 = 18 miles.
Therefore, on Monday, Mona biked M = 18 / 3 = <<18/3=6>>6 miles.
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