There are several tons of grain in the warehouse, and 6.9 tons are shipped out, which is exactly 2.3 times the rest. How many tons of grain are there in the warehouse?
仓库有粮食若干吨，运出6.9吨，运出的正好是剩下的2.3倍，仓库原来存有粮食多少吨？
<gadget id="calculator">6.9 / 2.3</gadget>
<output>3</output>

<gadget id="calculator">3 + 6.9</gadget>
<output>9.9</output>

<result>9.9</result>