There are 15 boys in the school aircraft model group, and girls account for 1/4 of the total number. How many people are there in the school aircraft model group?
学校航模组男生一共15人，女生占全部人数的(1/4)，学校航模组共有多少人？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">15 / (3/4)</gadget>
<output>20</output>

<result>20</result>