The cafeteria bought 35 kilograms of radishes from the vegetable market, and bought 15 kilograms less green vegetables than 3 times the amount of radishes, and twice as much vegetables as tomatoes. How many kilograms of tomatoes did the cafeteria buy?
食堂在菜场买来35千克萝卜，买的青菜比萝卜的3倍少15千克，买的青菜是西红柿的2倍，食堂买来西红柿多少千克？
<gadget id="calculator">35 * 3</gadget>
<output>105</output>

<gadget id="calculator">105 - 15</gadget>
<output>90</output>

<gadget id="calculator">90 / 2</gadget>
<output>45</output>

<result>45</result>