Uncle Wang took 180 yuan to buy briquettes. Because the price of coal has dropped (1/4), he bought 100 more briquettes than before. How much is each briquette?
王大爷带180元去买蜂窝煤，由于煤价降低了(1/4)，结果这些钱比原来多买了100个，则原来每个蜂窝煤多少钱？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) / 100 / (3/4)</gadget>
<output>1/300 = around 0.003333</output>

<gadget id="calculator">180 * (1/300)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>