In the physical education class, the teacher divided the students into 4 groups and carried out a medicine ball game. As a result, the number of balls dribbled by the students in the first group was half of the total number of the other three groups, and the number of balls dribbled by the students in the second group was the same (1/3) of the total number of balls dribbled. The number of balls dribbled by the students in the third group was (1/4) of the total number of dribbles in the other three groups. The fourth group dribbled 13 balls. How many balls did the students dribble in total?
体育课上，老师将同学们分成4组，开展运实心球的比赛，结果第一组同学运的球数是其他三组运的总数的一半，第二组同学运的球数是其他三组运的总数的(1/3)，第三组同学运的球数是其他三组运的总数的(1/4)，第四组运了13个，同学们共运了多少个球？
<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 + 4</gadget>
<output>5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/3) - (1/4) - (1/5)</gadget>
<output>13/60 = around 0.216667</output>

<gadget id="calculator">13 / (13/60)</gadget>
<output>60</output>

<result>60</result>