A certain grain station purchased a batch of rice, transported away (1/3) for the first time, and transported the rest (1/4) for the second time. It is known that 50 tons were transported for the second time. How many tons was the original batch of rice purchased?
某粮站收购一批稻谷，第一次运走了(1/3)，第二次运走了余下的(1/4)．已知第二次运走了50吨．收购的这批稻谷原来有多少吨？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">50 / (1/4) / (2/3)</gadget>
<output>300</output>

<result>300</result>