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?
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.
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