The length of the first rope is 8 meters, and the length of the other rope is 3 times that of it. After cutting off how many meters, the length of the second rope is the same as the first one.
第一根绳子长8米，另一根绳子是它的3倍，第二根绳子剪掉多少米后和第一根一样长．
<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<gadget id="calculator">24 - 8</gadget>
<output>16</output>

<result>16</result>