A's number is 30, and B's number is 15 times that. What is the sum of the numbers A and B?
甲数是30，乙数是它的15倍．甲、乙两数的和是多少？
<gadget id="calculator">30 * 15</gadget>
<output>450</output>

<gadget id="calculator">450 + 30</gadget>
<output>480</output>

<result>480</result>