The quotient of dividing the number A by the number B is 1.5, if the number A increases by 20, then the number A is twice the number B. What is the original number of A?
甲數除以乙數的商是1.5，如果甲數增加20，則甲數是乙數的2倍．原來甲數是多少．
<gadget id="calculator">2 - 1.5</gadget>
<output>0.5</output>

<gadget id="calculator">20 / 0.5</gadget>
<output>40</output>

<gadget id="calculator">40 * 1.5</gadget>
<output>60</output>

<result>60</result>