There are 18 girls in class 51, which is 1/4 less than boys. How many boys are there?
五1班有女生18人，比男生少(1/4)，男生有多少人？
<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">18 / (3/4)</gadget>
<output>24</output>

<result>24</result>