Madeline spends 4*7=<<4*7=28>>28 hours on homework.

She spends 8*7-56 hours sleeping.

Therefore, she is busy 28+18+56+20=<<28+18+56+20=122>>122 hours per week.

There are 7*24=<<7*24=168>>168 hours per week.

Thus, Madeline has 168-122=<<168-122=46>>46 hours left over.

# Answer

46
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Madeline spends 18 hours a week in class. She spends 4 hours per day working on homework. She spends 8 hours per day sleeping. She works part-time 20 hours per week. How many hours left over does Madeline have?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
46
Madeline spends 18 hours a week in class. She spends 4 hours per day working on homework. She spends 8 hours per day sleeping. She works part-time 20 hours per week. How many hours left over does Madeline have?
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