To build a road, the full length (4/15) was repaired in the first week, and the full length (1/10) was repaired less in the second week than in the first week. What fraction of the total length was completed in two weeks?
修一条公路，第一周修了全长的(4/15)，第二周比第一周少修全长的(1/10)．两周共修了全长的几分之几？
<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(4/15) * (9/10)</gadget>
<output>6/25 = around 0.24</output>

<gadget id="calculator">(6/25) + (4/15)</gadget>
<output>38/75 = around 0.506667</output>

<result>38/75 = around 0.506667</result>