If the latter item of 8:25 is increased by 50, how much should the former item be increased to keep the ratio constant.
如果把8：25的后项增加50，要使比值不变，前项应增加多少．
<gadget id="calculator">25 + 50</gadget>
<output>75</output>

<gadget id="calculator">75 / 25</gadget>
<output>3</output>

<gadget id="calculator">3 * 8</gadget>
<output>24</output>

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

<result>16</result>