It is known that the product of two factors is 75.6, one of which is 21, and what is the other factor.
已知两个因数的积是75.6，其中一个因数是21，另一个因数是多少．
<gadget id="calculator">75.6 / 21</gadget>
<output>3.6</output>

<result>3.6</result>