There is a batch of cabbage at the vegetable station, 40% of which are sold on the first day, and 90 kilograms are sold on the second day. At this time, the ratio of sold to unsold is 5:3. How many kilograms were sold on the first day?
菜站有一批白菜，第一天卖出了40%，第二天卖出了90千克，这时卖了的与没卖出的比是5：3，第一天卖出了多少千克？
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

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

<gadget id="calculator">(5/8) - (2/5)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">90 / (9/40)</gadget>
<output>400</output>

<gadget id="calculator">400 * (2/5)</gadget>
<output>160</output>

<result>160</result>