The store shipped pears, apples, and oranges to a total of 400 kg, of which pears accounted for (1/5). The ratio of the weight of apples to the weight of oranges is 1:3. How many kilograms does an apple weigh?
商店运来梨、苹果、桔子三种水果共400千克，其中梨的重量占(1/5)．苹果的重量和桔子重量的比是1：3．苹果有多少千克？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">400 * (1/5)</gadget>
<output>80</output>

<gadget id="calculator">400 - 80</gadget>
<output>320</output>

<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">320 * (1/4)</gadget>
<output>80</output>

<result>80</result>