To decorate the classroom on Children's Day, the school bought 90 balloons, first distributed 30 to the fifth grade, and then distributed the remaining balloons to the 6 classes of the fourth grade. How many balloons can each class get?
"六一"儿童节装饰教室，学校买了90只气球，先分给五年级30只，再把剩下的气球平均分给四年级6个班，每班可分得几只气球？
<gadget id="calculator">90 - 30</gadget>
<output>60</output>

<gadget id="calculator">60 / 6</gadget>
<output>10</output>

<result>10</result>