When two numbers are multiplied, if the multiplier increases by 5, the product increases by 90; if the multiplicand decreases by 5, the product decreases by 120; what is the original product of the two numbers?
两个数相乘，如果乘数增加5，积就增加90；如果被乘数减少5，积就减少120；原来两数的积是多少．
<gadget id="calculator">90 / 5</gadget>
<output>18</output>

<gadget id="calculator">120 / 5</gadget>
<output>24</output>

<gadget id="calculator">18 * 24</gadget>
<output>432</output>

<result>432</result>