<human>:  It’s exam season and Tristan has several exams to prepare for. On Monday, he studies for 4 hours then studies for twice this long on Tuesday. On Wednesday, Thursday, and Friday he studies for 3 hours each day. He wants to study for a total of 25 hours over the week and divides the remaining amount of study time evenly between Saturday and Sunday. How many hours does Tristan spend studying on Saturday?
<bot>: How many hours does Tristan study on Tuesday? ** On Tuesday, Tristan studies twice as long as he did on Monday and this amounts to 4 hours * 2 = <<4*2=8>>8 hours.
How many hours does Tristan study in the first 5 days of the week? ** So in the first 5 days of the week, he studies for a total of 4 hours Monday + 8 hours Tuesday + 3 hours Wednesday + 3 hours Thursday + 3 hours Friday = 21 hours.
How many hours does Tristan have left to study? ** He therefore has 25 planned hours – 21 used hours = <<25-21=4>>4 hours left to study.
How many hours does Tristan spend studying on Saturday? ** As he splits his time evenly over 2 days, he spends 4 hours / 2 = <<4/2=2>>2 hours studying on Saturday.
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