The construction site needs to transport a batch of sand and gravel, (1/5) of this batch of sand and gravel is delivered in the first three days, and 30% of this batch of sand and gravel is delivered in the next three days. It is known that there is a difference of 340 tons between the sand and gravel transported in the first three days and the next three days. How many tons are there in total for this batch of gravel?
建筑工地要运送一批砂石料，前三天运送了这批砂石料的(1/5)，后三天运送了这批砂石料的30%．已知前三天与后三天运送的砂石料相差340吨．这批砂石料共有多少吨？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(3/10) - (1/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">340 / (1/10)</gadget>
<output>3_400</output>

<result>3_400</result>