Machine A and Machine B produce widgets at constant rates. How many widgets does Machine A produce in 4 hours?

The correct answer to the question "Machine A and Machine B produce widgets at constant rates. How many widgets does Machine A produce in 4 hours?" is Option C: Both statements together are sufficient, but neither statement alone is sufficient..

The other options — A) Statement (1) alone is sufficient, but statement (2) alone is not sufficient., B) Statement (2) alone is sufficient, but statement (1) alone is not sufficient., D) Neither statement alone nor both statements together are sufficient. — are incorrect for this GMAT Exam Prep question. As explained above: (1) A + B = 50 widgets/hour. Insufficient. (2) B = 25 widgets/hour. Insufficient. Together: Substitute B=25 into (1) gives A+25=50, so A=25 widgets/hour. In 4 hours, A produces 4 * 25 = 100 widgets. …