40% of the number A is equal to (2/3) of the number B (the number A and the number B are not 0), the difference between the number A and the number B is 12, what is the number A?
甲数的40%与乙数的(2/3)相等(甲数、乙数均不为0)，甲数与乙数之差为12，甲数为多少．
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<result>30</result>