Joke

“Why are you not going to school today, my son,” enquired the mother.

“No, I won’t go.”

“But why?” the mother again asked with curiosity.

“Because our teachers always keep on shifting their ground.”

“How’s that?”

“Day before yesterday my teacher told me that 5 and 2 are seven and yesterday said 3 and 4 are seven. Well, what’s the use of going to such a school?”