Can something abstract be perceived by one or more of the five senses.

An abstract is a thought or an idea that cannot be seen, felt, heard, smelled, and tasted without being expressed by the person holding it. It is physically nonexistent; thus, it can't be perceived by one or more of the five senses. Once an abstract is either spoken or put into action, then some of the senses can perceive it.

at hatfield elementary school, there are 504 students in 7 classes. each class has the same number of students. what is a good estimate of the number of students in each class?