If "A woman in a red vest working at a computer." does that mean that "Woman is working."?\nOptions:\n- yes\n- it is not possible to tell\n- no
A step-by-step solution is:
it is not possible to tell
Someone may be working at building or repairing a computer but yet not be necessarily 'working' in the broader sense of the word.

.

Thus, the answer is it is not possible to tell