The quotient of the number A divided by the number B is (2/5). The average of the two numbers of A and B is 28. What is the number A?
甲数除以乙数的商是(2/5)，甲乙两数的平均数是28，甲数是多少．
<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">28 * (2/7) * 2</gadget>
<output>16</output>

<result>16</result>