Grandpa Li bought 3 chickens for 84 yuan. How much more does he need to buy 5 chickens like this?
李爷爷买3只鸡用了84元，他想买5只这样的鸡，还需要多少钱？
<gadget id="calculator">84 / 3</gadget>
<output>28</output>

<gadget id="calculator">28 * 5</gadget>
<output>140</output>

<gadget id="calculator">140 - 84</gadget>
<output>56</output>

<result>56</result>