Class 59 and Class 510 of Hongxing Primary School went boating in the park. There are 49 students in Class 5 and 9, and 56 students in Class 5 and 10. If the two classes are divided into groups and take the boat, how many boats should be rented to make the number of people on each boat equal?
红星小学五9班和五10班同学去公园划船．五9班49人，五10班56人，把两班学生分小组乘船，要使得每条船上的人数相等，至少要租多少条船？
<gadget id="calculator">49 / 7</gadget>
<output>7</output>

<gadget id="calculator">56 / 7</gadget>
<output>8</output>

<gadget id="calculator">7 + 8</gadget>
<output>15</output>

<result>15</result>