There are 7 classes in the primary and middle grades in Longhai, and each class has 48 students, including 187 girls and how many boys?
龙海中小中年级有7个班，每个班有48人，其中女生有187人，男生有多少人？
<gadget id="calculator">48 * 7</gadget>
<output>336</output>

<gadget id="calculator">336 - 187</gadget>
<output>149</output>

<result>149</result>