There is a rich man who has a property of 35 million U.S. dollars. Before he died, he wrote such a will to his pregnant wife: If a boy is born, he will give two-thirds of the property to the son, and the mother will take one-third; If a girl is born, give one-third of the property to the daughter and two-thirds to the mother. As a result, his wife gave birth to twins, a boy and a girl. According to the requirements of the will, the son will get tens of thousands of dollars.
有一位富翁有3500万美元财产，在临终前，他对怀孕的妻子写下这样的一份遗嘱：如果生下来是个男孩，就把财产的三分之二给儿子，母亲拿三分之一；如果生下来是个女孩，就把财产的三分之一给女儿，三分之二给母亲．结果他的妻子生下一男一女的双胞胎，按照遗嘱的要求，儿子可得多少万美元．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

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

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 2 + 1</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">3_500 * (4/7)</gadget>
<output>2_000</output>

<result>2_000</result>