Mom bought some apples, ate half of them yesterday, and ate the rest today, leaving 18 apples. How many apples did mom buy in total?
妈妈买了一些苹果，昨天吃了一半，今天又吃了剩下的一半，还剩下18个．妈妈一共买来多少个苹果？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">18 / (1/2) / (1/2)</gadget>
<output>72</output>

<result>72</result>