A certain granary transported 320 tons of rice, which is equivalent to four times the original amount of stored grain. How many tons of original stored grain?
某粮仓运进大米320吨，相当于原来存粮数的4倍，原来存粮多少吨？
<gadget id="calculator">320 / 4</gadget>
<output>80</output>

<result>80</result>