A farmer extracts 5 liters of milk a day from a cow. Since he has 3 cows, how many more cows does he need to have to produce 25 liters of milk a day?
He extracts 5*3=
<gadget id="calculator">5*3</gadget>
<output>15</output>
15 liters of milk in a day.
He should extract 25-15=
<gadget id="calculator">25-15</gadget>
<output>10</output>
10 liters more in a day.
For that, he needs 10/5=
<gadget id="calculator">10/5</gadget>
<output>2</output>
2 more cows.

<result>2</result>