toy rabbits are sold for 10 yuan, 5 toy bears are sold for 20 yuan, and a kindergarten bought 18 toy rabbits and bears for 70 yuan, so how many toy rabbits are there?
3只玩具兔卖10元，5只玩具熊卖20元，某幼儿园花了70元共买了18只玩具兔和熊，那么其中玩具兔有几只多少
<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<gadget id="calculator">4 * 18</gadget>
<output>72</output>

<gadget id="calculator">72 - 70</gadget>
<output>2</output>

<gadget id="calculator">10 / 3</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">4 - (10/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">2 / (2/3)</gadget>
<output>3</output>

<result>3</result>