It is known that a:b=c:d, now a is expanded by 2 times, b is reduced to the original (1/3), and c remains unchanged, what should be the ratio of d is still valid.
已知a：b=c：d，现将a扩大2倍，b缩小到原来的(1/3)，而c不变，d应多少，比例仍然成立．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>