A birthday cake, cut into quarters, each piece weighs 50 grams more than each piece divided into fifths, how many grams does the birthday cake weigh in total?
一个生日蛋糕，切成四等分的每块比分成五等分的每块重50克，这个生日蛋糕共重多少克？
<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">50 / (1/20)</gadget>
<output>1_000</output>

<result>1_000</result>