The school brigade department organizes students to do good deeds for military martyrs and poor households. There are 53 boys and 38 girls. Every 7 people form an activity group. How many groups can be formed?
学校大队部组织同学们为军烈属和困难户做好事，男生有53人，女生有38人，每7人编成一个活动小组，可以编成多少个小组？
<gadget id="calculator">53 + 38</gadget>
<output>91</output>

<gadget id="calculator">91 / 7</gadget>
<output>13</output>

<result>13</result>