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 = 
<gadget id="calculator">1.5*12</gadget>
<output>18</output>
18 kg.
Luca = 9 * 11 = 
<gadget id="calculator">9*11</gadget>
<output>99</output>
99 kg
99 - 18 = 
<gadget id="calculator">99-18</gadget>
<output>81</output>
81 kg.
Luca lost 81 kg more than Barbi.

<result>81</result>