The school bought 15 kilograms of tomatoes and 20 kilograms of cucumbers for a total of 68.5 yuan, 1.7 yuan per kilogram of cucumbers, how much is the tomato per kilogram?
学校买来15千克西红柿和20千克黄瓜，共用去68.5元，每千克黄瓜1.7元，西红柿每千克多少元？
<gadget id="calculator">1.7 * 20</gadget>
<output>34</output>

<gadget id="calculator">68.5 - 34</gadget>
<output>34.5</output>

<gadget id="calculator">34.5 / 15</gadget>
<output>2.3</output>

<result>2.3</result>