On Tuesday, Oliver worked out for 4 - 2 = <<4-2=2>>2 hours.

On Wednesday he decided to work out twice as much as on Monday, so for 2 * 4 = <<2*4=8>>8 hours.

On Thursday, at home, Oliver trained twice as much as on Tuesday, so for 2 * 2 = <<2*2=4>>4 hours.

In total Oliver trained for 4 + 2 + 8 + 4 = <<4+2+8+4=18>>18 hours.

# Answer

18
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Oliver is working out in a gym. On Monday he worked out for 4 hours, and the next day for 2 hours less. On Wednesday he decided to work out twice as much as on Monday. On Thursday the gym was closed, so Oliver needed to exercise at home which took twice as much time as on Tuesday. How many hours in total have Oliver worked out during these four days?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
18
Oliver is working out in a gym. On Monday he worked out for 4 hours, and the next day for 2 hours less. On Wednesday he decided to work out twice as much as on Monday. On Thursday the gym was closed, so Oliver needed to exercise at home which took twice as much time as on Tuesday. How many hours in total have Oliver worked out during these four days?
train