The landscaping team wanted to plant a batch of saplings. On the first day, they planted 1/5 of the total number, and on the second day they planted 126. At this time, the ratio of the remaining to the number of saplings planted was 5:3. How many saplings are there in total?
园林绿化队要栽一批树苗，第一天栽了总数的(1/5)，第二天栽了126棵，这时剩下的与已栽的棵数的比是5：3．这批树苗一共有多少棵？
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

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

<gadget id="calculator">(3/8) - (1/5)</gadget>
<output>7/40 = around 0.175</output>

<gadget id="calculator">126 / (7/40)</gadget>
<output>720</output>

<result>720</result>