A boxer weighs 97 kg at 4 months from a fight. He is on a diet that allows him to lose 3 kg per month until the day of the fight. How much will he weigh on the day of the fight?
In 4 months, he will lose 3 x 4 = 
<gadget id="calculator">3*4</gadget>
<output>12</output>
12 kilograms.
So his weight will be 97 - 12 = 
<gadget id="calculator">97-12</gadget>
<output>85</output>
85 kilograms.

<result>85</result>