The way to prepare diluted juice is to add 4 cups of boiled water to 1 cup of raw juice, how many cups of raw juice should be poured into 20 cups of water, and how to express the relationship between the original juice and the number of cups of water?
稀释果汁调配方式是1杯原汁要加上4杯开水，20杯水要倒入多少杯原汁调配，怎样表示果汁原汁与水的杯数之间的关系？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 20</gadget>
<output>5</output>

<result>5</result>