To build a road, the full length (4/15) was built on the first day, and the full length (1/3) was built on the second day. What fraction of the total length was built in two days?
修一条公路，第一天修了全长的(4/15)，第二天修了全长的(1/3)，两天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 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(4/15) + (1/3)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>