The product of the two numbers A and B is 5.7. If the number A is expanded to 5 times the original number and the number B remains unchanged, then what is the product of the two numbers A and B?
甲、乙两数的积是5.7，如果甲数扩大到原来的5倍，乙数不变，那么，甲、乙两数的积是多少．
<gadget id="calculator">5.7 * 5</gadget>
<output>28.5</output>

<result>28.5</result>