problem-n; 2 Senses

Sense Number 1: troubles

Commentary: job, trouble - a state or source of difficulty

She and her husband are having problems.
It is always a job to contact him.
Urban problems such as traffic congestion and smog are reason enough to move.
One problem after another delayed the job.
What's the problem?

WordNet 2.0 Sense Numbers: 1 2

Sense Number 2: tasks

Commentary: a question raised for consideration or solution

Our homework consisted of ten problems to solve.

WordNet 2.0 Sense Numbers: 3