Cucumber, wax gourd and tomato are three kinds of vegetables. It is known that cucumber and tomato account for 75% of the total, tomato and winter melon account for 80% of the total, and cucumber is 40 kg less than winter melon. How many kilograms are the cucumbers and tomatoes together?
黄瓜、冬瓜、西红柿三种蔬菜，已知黄瓜和西红柿占总数的75%，西红柿和冬瓜占总数的80%，黄瓜比冬瓜少40千克．黄瓜和西红柿共多少千克？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(4/5) - (3/4)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">40 / (1/20)</gadget>
<output>800</output>

<gadget id="calculator">800 * (3/4)</gadget>
<output>600</output>

<result>600</result>