A factory completed the first quarter (3/8) in January, and completed the first quarter plan (9/20) in February. How much more can be completed in March to just complete the plan for the first quarter?
某工厂一月份完成第一季度的(3/8)，二月份完成第一季度计划的(9/20)，三月份再完成多少就刚好完成第一季度的计划？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (3/8) - (9/20)</gadget>
<output>7/40 = around 0.175</output>

<result>7/40 = around 0.175</result>