Mom has 40 pieces of chocolate, she will give (3/8) to her younger sister, and the younger sister will give her (2/5) to her younger brother, how many pieces of chocolate will the younger brother get? (Hint: use the meaning of fractions to answer)
妈妈有40块巧克力，她将(3/8)给妹妹，妹妹又把自己所得的(2/5)送给弟弟，弟弟得几块巧克力？(提示：用分数的意义解答)
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">40 * (3/8) * (2/5)</gadget>
<output>6</output>

<result>6</result>