total of 450 kilograms of potatoes and tomatoes are shipped from the vegetable market. The quality of potatoes is 2/7 that of tomatoes. How many kilograms of tomatoes are shipped?
菜市场运来土豆和西红柿共450千克，其中土豆的质量是西红柿的(2/7)，运来西红柿多少千克？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 + (2/7)</gadget>
<output>9/7 = around 1.285714</output>

<gadget id="calculator">450 / (9/7)</gadget>
<output>350</output>

<result>350</result>