多少同学家有电脑用英语怎么说

How many students have computers at home?
students是广义的学生，classmates是班级的同学，只能用于同学称呼同学
computer要加s表示复数

How many classmates have computers?

How many classmates have computers at home?

How many schoolmates does the family have the computer?

how many students(classmates) have computer at home?

How many sutdents have computer at home?