Mr. Zhang took some money to buy a signature pen. When he arrived at the store, he found that the price of this pen had been reduced by 25%. As a result, the money he brought happened to be enough to buy 25 more pens than before. So how many signature pens can you buy with the money before the price cut.
张老师带着一些钱去买签字笔，到商店后发现这种笔降价了25%，结果他带的钱恰好可以比原来多买25支．那么降价前这些钱可以买签字笔多少支．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">25 * (1/4)</gadget>
<output>25/4 = around 6.25</output>

<gadget id="calculator">25 - (25/4)</gadget>
<output>75/4 = around 18.75</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">(75/4) / (1/4)</gadget>
<output>75</output>

<result>75</result>