Three kinds of fruits are shipped from the store, among which pears account for (1/5) of the weight. The ratio of the weight of the apple to the sum of the weight of the other two fruits is 1:3, and the apple is 20 kg more than the pear. How many kilograms of fruit are shipped in total?
商店运来三种水果，其中梨的重量占(1/5)．苹果的重量和其他两种水果重量之和的比为1：3，苹果比梨多20千克．一共运来水果多少千克？
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">20 / (1/20)</gadget>
<output>400</output>

<result>400</result>