In order to beautify the campus, the third grade planted 105 flowers, the fourth grade planted twice as many flowers as the third grade, the fifth grade planted 15 more flowers than the third and fourth grade combined, and how many flowers were planted in the fifth grade?
为美化校园，三年级种花105棵，四年级种的棵数是三年级的2倍，五年级种的棵数比三、四年级棵数总和多15棵，五年级种多少棵？
<gadget id="calculator">105 * 2</gadget>
<output>210</output>

<gadget id="calculator">210 + 105 + 15</gadget>
<output>330</output>

<result>330</result>