Dafeng Supermarket packs a batch of bulk rice into bags, requiring each bag of rice to have the same weight. For the first time, 40% of the total amount of rice was taken out, and 15 kg was left after filling 30 bags; for the second time, all the remaining bulk rice was packed into 50 bags (the weight of each bag of rice was the same as that of the first bagging) ). How many kilograms is this batch of rice in total?
大丰超市给一批散装大米装袋，要求每袋大米的重量相同．第一次拿出大米总量的40%，装了30袋还余下15千克；第二次把所有剩余的散装大米正好又装了50袋(每袋大米的重量与第一次装袋时相同)．这批大米共有多少千克？
<gadget id="calculator">30 + 50</gadget>
<output>80</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">15 * (3/5)</gadget>
<output>9</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 15</gadget>
<output>6</output>

<gadget id="calculator">9 + 6</gadget>
<output>15</output>

<gadget id="calculator">(2/5) * 50</gadget>
<output>20</output>

<gadget id="calculator">30 * (3/5)</gadget>
<output>18</output>

<gadget id="calculator">20 - 18</gadget>
<output>2</output>

<gadget id="calculator">15 / 2</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">80 * (15/2)</gadget>
<output>600</output>

<result>600</result>