certain class of boys outnumbers girls (5/6), and later transfers a boy from another school. At this time, the number of boys outnumbers girls (7/8). How many girls are there in this class?
某班男生是女生人数的(5/6)，后来从外校转来1名男生，这时男生人数是女生人数的(7/8)，这个班有女生多少人？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(7/8) - (5/6)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">1 / (1/24)</gadget>
<output>24</output>

<result>24</result>