The school planted a batch of saplings in 3 days, 80 were planted on the first day, and (3/8) of the total number were planted on the second day. How many trees will the school plant in total?
学校用3天时间栽一批树苗，第一天栽了80棵，第二天又栽了总数的(3/8)，这时已栽的树苗与未栽的相等．学校一共要栽树多少棵？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) - (3/8)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">80 / (1/8)</gadget>
<output>640</output>

<result>640</result>