There are three kinds of fruits in the fruit shop, including 500 kilograms of apples and pears, and 400 kilograms of apples and oranges. The ratio of the weight of apples to the three kinds of fruits is 5:13. How many kilograms are the three fruits in total?
水果店有三种水果，其中苹果和梨500千克，苹果和桔子共400千克，苹果与三种水果重量和的比5：13．三种水果共有多少千克？
<gadget id="calculator">500 + 400</gadget>
<output>900</output>

<gadget id="calculator">5 / 13</gadget>
<output>5/13 = around 0.384615</output>

<gadget id="calculator">1 + (5/13)</gadget>
<output>18/13 = around 1.384615</output>

<gadget id="calculator">900 / (18/13)</gadget>
<output>650</output>

<result>650</result>