a:b=c:d, if b is enlarged to 10 times of the original, how much must C be reduced to make the ratio true
a：b=c：d，如果b扩大到原来的10倍，要使比例成立，C必须缩小到原来的多少
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>