The number of A is (15/16), the number of B is (2/5) of the number of A, what is the number of B.
甲数是(15/16)，乙数是甲数的(2/5)，乙数是多少．
<gadget id="calculator">15 / 16</gadget>
<output>15/16 = around 0.9375</output>

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

<gadget id="calculator">(15/16) * (2/5)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>