The kindergarten bought some apples and ate (1/5) on the first day and (1/4) on the second day. They ate a total of 45 kilograms in two days. How many kilograms of apples did the kindergarten buy?
幼儿园买来一些苹果，第一天吃了(1/5)，第二天吃了(1/4)，两天一共吃了45千克，幼儿园买来多少千克苹果？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/5) + (1/4)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">45 / (9/20)</gadget>
<output>100</output>

<result>100</result>