There are some apples and pears at home, and the number of pears is 2 less than that of apples (1/3). The ratio of the number of apples and pears they eat every day is 2:1. When the pears are eaten, there are still 15 apples left. How many apples are there?
明明家有一些苹果和梨，梨的个数比苹果的(1/3)少2个．他们每天吃掉的苹果和梨的个数比是2：1，当梨吃完时，苹果还剩15个．原来有苹果多少个．
<gadget id="calculator">15 / 2</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">(15/2) - 2</gadget>
<output>11/2 = around 5.5</output>

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

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) * 1</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(11/2) / (1/6)</gadget>
<output>33</output>

<result>33</result>