When one factor is 27 and the other factor is multiplied by 9 times, what should be the factor 27 to keep the product unchanged?
一个因数是27，另一个因数扩大9倍时，要使积不变，因数27应变成多少．
<gadget id="calculator">27 / 9</gadget>
<output>3</output>

<result>3</result>