The number of A is b less than the number of B (2/3). If the number of B is a, what is the number of A?
甲数比乙数的(2/3)少b，如果乙数是a，甲数是多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>