The greening team planted trees in three groups. The number of trees planted by the first group was (5/13) the total number of the other two groups; the number of trees planted by the second group was (1/3) the total number of the other two groups; Planted 51 trees. How many trees were planted in the three groups?
绿化队分三组植树，第一组植的棵数是其他两组植的总数的(5/13)，第二组植的棵数是其他两组总数的(1/3)，第三组植了51棵．三个组共植树多少棵．
<gadget id="calculator">13 + 5</gadget>
<output>18</output>

<gadget id="calculator">5 / 18</gadget>
<output>5/18 = around 0.277778</output>

<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (5/18) - (1/4)</gadget>
<output>17/36 = around 0.472222</output>

<gadget id="calculator">51 / (17/36)</gadget>
<output>108</output>

<result>108</result>