The number of people who participated in the choir in the third grade of a certain school accounted for (1/8) of the whole grade, and then another person joined the choir. ． How many students are there in the third grade?
某校三年级参加合唱团的人数占全年级人数的(1/8)，后来又有一人参加了合唱团，这时全年级参加合唱团的人数是未参加合唱团人数的(1/6)．三年级共有多少个学生？
<gadget id="calculator">1 + 6</gadget>
<output>7</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/7) - (1/8)</gadget>
<output>1/56 = around 0.017857</output>

<gadget id="calculator">1 / (1/56)</gadget>
<output>56</output>

<result>56</result>