When multiplying two factors, if the first factor increases by 5 and the other factor remains unchanged, the product increases by 35. If the first factor remains unchanged and the other factor decreases by 9, the product decreases by 243. What is the product of multiplying these two numbers?
两个因数相乘，如果第一个因数增加5另一个因数不变积就增加35，如果第一个因数不变，另一个因数减少9，那么积就减少243．这两个数相乘的积是多少．
<gadget id="calculator">243 / 9</gadget>
<output>27</output>

<gadget id="calculator">27 * 7</gadget>
<output>189</output>

<result>189</result>