If 20 people rent a boat together, if there are 5 more people who rent the boat, the average rent spent by each person will be reduced by 1 yuan. What is the rent for renting a boat?
20个人合租一条船，如果租船的人再加5个，平均每人所花的租金就减少1元，则租一条船的租金为多少元．
<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

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

<gadget id="calculator">(1/20) * 5</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) - 1</gadget>
<output>-3/4 = around -0.75</output>

<gadget id="calculator">1 + (-3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">25 / (1/4)</gadget>
<output>100</output>

<result>100</result>