The number of A is (5/8), and the number of B is equivalent to (4/15) of the number of A. What is the number of B?
甲数是(5/8)，乙数相当于甲数的(4/15)，乙数是多少？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">(5/8) * (4/15)</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>