A ratio is 5:8, if the former term is expanded to 4 times of the original, how much should be added to the latter term to keep the ratio unchanged.
一个比是5：8，如果前项扩大到原来的4倍，要使比值不变，后项应加上多少．
<gadget id="calculator">32 - 8</gadget>
<output>24</output>

<result>24</result>