The store shipped 450 towels on the first day, 30 fewer than twice as many on the second day. How many towels were shipped in total in two days?
商店第一天运进毛巾450条，比第二天的2倍少30条．两天一共运进毛巾多少条？
<gadget id="calculator">450 + 30</gadget>
<output>480</output>

<gadget id="calculator">480 / 2</gadget>
<output>240</output>

<gadget id="calculator">240 + 450</gadget>
<output>690</output>

<result>690</result>