It is known that a*b=120, and a:4=x:2b, how much is x=?
已知a*b=120，并且a：4=x：2b，求x=多少．
<gadget id="calculator">2 * 120</gadget>
<output>240</output>

<gadget id="calculator">240 / 4</gadget>
<output>60</output>

<result>60</result>