A, B, and C plant trees. The number of trees of species A is the sum of the numbers of trees of species B and C (1/2), and the number of trees of species B is the sum of the numbers of trees of species A and C (1/3). It is known that C has planted 130 trees, how many trees has A planted?
甲、乙、丙三人植树，甲种的棵数是乙、丙种的棵数的和的(1/2)，乙种的棵数是甲、丙种的棵数和的(1/3)，已知丙种了130棵，那么甲种了多少棵．
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</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 - (1/3) - (1/4)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">130 / (5/12)</gadget>
<output>312</output>

<gadget id="calculator">312 * (1/3)</gadget>
<output>104</output>

<result>104</result>