The two brothers each have a number of pencils. The younger brother said: "If my brother gives me 6 pencils, then I will have three times as many pencils as he does." The older brother said: "If my brother gives me 6 pencils, then we will have the same number of pencils." a pencil.
兄弟二人各有铅笔若干支．弟弟说："如果哥哥给我6支，那么我的铅笔数将是他的3倍．"哥哥说："如果弟弟给我6支，那么我俩的铅笔数将一样多．"弟弟原来有多少支铅笔．
<gadget id="calculator">6 * 2 * 3</gadget>
<output>36</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">36 + 18 + 6</gadget>
<output>60</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<result>30</result>