Aunt Wang bought a basket of apples at the price of 1 yuan and 2 apples, and then sold all these apples at the price of 2 yuan and 3 apples. As a result, she made a total profit of 20 yuan. How many apples did Aunt Wang buy in a basket?
王大妈以1元钱2个苹果的价钱买进一筐苹果，又以2元钱3个苹果的价格把这些苹果全部卖出，结果一共赚的利润20元．王大妈买进的一筐苹果有多少个．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">(2/3) - (1/2)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">20 / (1/6)</gadget>
<output>120</output>

<result>120</result>