There are two numbers A and B, and (2/5) of A is equal to (2/3) of B. If A subtracts 3 and B adds 5, the two numbers are equal, then the product of A and B how many.
甲、乙两数，甲数的(2/5)等于乙数的(2/3)，若甲数减去3，乙数加上5，则两数相等，那么甲数与乙数的积是多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 * (2/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">5 * (2/5)</gadget>
<output>2</output>

<gadget id="calculator">(6/5) + 2</gadget>
<output>16/5 = around 3.2</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) - (2/5)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">(16/5) / (4/15)</gadget>
<output>12</output>

<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">12 * (5/3) * 12</gadget>
<output>240</output>

<result>240</result>