The Monkey King brought some apples and pears to the little monkeys. Each little monkey is given 2 pears and 5 apples each time, and there are 12 apples left in the end, and the pears are just finished. Only then did the Monkey King realize that the number of apples he brought was three times that of pears. How many monkeys participated in dividing apples and pears?
猴王提来一些苹果和梨分给小猴子们．每只小猴每次给2个梨和5个苹果，最后还剩下12个苹果，梨正好分完．这时猴王才想起它提来的苹果个数是梨的3倍．参加分苹果和梨的小猴一共有多少只．
<gadget id="calculator">12 / 5</gadget>
<output>12/5 = around 2.4</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

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

<gadget id="calculator">(3/5) - (1/2)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(12/5) / (1/10) / 2</gadget>
<output>12</output>

<result>12</result>