There are 60 students in the fifth and second class, and 15 students participated in the calligraphy competition. How many people did not participate in the calligraphy competition accounted for the whole class.
五二班有学生60人，参加书法比赛的有15人，没有参加书法比赛的人数占全班人数的多少．
<gadget id="calculator">60 - 15</gadget>
<output>45</output>

<gadget id="calculator">45 / 60</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>