The product of A and B is 15. If both A and B are doubled, what is the product of A and B?
甲、乙两数的积是15，如果甲数、乙数都扩大2倍，那么，甲、乙两数的积是多少．
<gadget id="calculator">15 * 2 * 2</gadget>
<output>60</output>

<result>60</result>