Barbi = 1.5 * 12 months = <<1.5*12=18>>18 kg

Luca = 9 * 11 = <<9*11=99>>99 kg

99 - 18 = <<99-18=81>>81 kg

Luca lost 81 kg more than Barbi.

# Answer

81
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Barbi lost 1.5 kilograms each month for a year. Luca lost 9 kilograms every year for 11 years. How many more kilograms did Luca lose than Barbi?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
81
Barbi lost 1.5 kilograms each month for a year. Luca lost 9 kilograms every year for 11 years. How many more kilograms did Luca lose than Barbi?
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