Human: Tomas is hoping to run a marathon next year, which is 26.3 miles. He knows that each month he trains, he can run twice as far as the month before. If he can run 3 miles during the first month of training, how many total months before the marathon should he start training to ensure he can run far enough? Assistant:
In the first month he can run 3 miles.
In the second month he can run 6 miles because 3 x 2 = 6
In the third month he can run 12 miles because 6 x 2 = 12
In fourth month he can run 24 miles because 12 x 2 = 24
In fifth month he can run 48 miles because 24 x 2 = 48
He needs to start training 5 months ahead of time because 24 < 26.3 and 48>26.3.