batch of rice was brought in from the grain store along the river, 35% of the rice was sold in the morning on the first day, and 20% of the rice was sold in the afternoon; the remaining 75% was sold on the second day, and 3690 kg remained after two days. How many kilograms is this batch of rice in total?
沿江粮店运进一批大米，第一天上午售出35%，下午售出这批米的20%；第二天售出了余下的75%，两天后还剩3690千克．这批大米共有多少千克？
<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (7/20) - (1/5)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(9/20) * (3/4)</gadget>
<output>27/80 = around 0.3375</output>

<gadget id="calculator">1 - (7/20) - (1/5) - (27/80)</gadget>
<output>9/80 = around 0.1125</output>

<gadget id="calculator">3_690 / (9/80)</gadget>
<output>32_800</output>

<result>32_800</result>