(2/5) of number A is equal to (4/7) of number B, and number B is 14. What is the number of A?
甲数的(2/5)和乙数的(4/7)相等，乙数是14，甲数是多少？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

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

<gadget id="calculator">(4/7) / (2/5)</gadget>
<output>10/7 = around 1.428571</output>

<gadget id="calculator">14 * (10/7)</gadget>
<output>20</output>

<result>20</result>