Uncle Wang raised 16 white rabbits, 2 less than 3 times the number of gray rabbits. How many gray rabbits does Uncle Wang keep?
王大爷养了16只白兔，比养灰兔只数的3倍少2只．王大爷养灰兔多少只？
<gadget id="calculator">16 + 2</gadget>
<output>18</output>

<gadget id="calculator">18 / 3</gadget>
<output>6</output>

<result>6</result>