(2/3) of the number A is exactly 5 times of the number B, the number B is a, what is the number A?
甲数的(2/3)正好是乙数的5倍，乙数为a，甲数是多少．
<gadget id="calculator">15 / 2</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>