Mona bikes 30 miles each week to stay fit. This week, she biked on Monday, Wednesday, and Saturday. On Wednesday, she biked 12 miles. On Saturday, she biked twice as far as on Monday. How many miles did she bike on Monday?
Mona bikes [NUMBER] miles each week to stay fit. This week, she biked on [NUMBER], [NUMBER], and [DAY]. On [DAY], she biked [NUMBER] miles. On [DAY], she biked twice as far as on [DAY]. How many miles did she bike on [DAY]?
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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