It is known that the product of two factors is 4.2, one of which is 7, and what is the other factor.
已知两个因数的积是4.2，其中一个因数是7，另一个因数是多少．
<gadget id="calculator">4.2 / 7</gadget>
<output>0.6</output>

<result>0.6</result>