Of 30 applicants for a job, 14 had at least 4 years experience, 18 had degrees, and 3 had less than 4 years experience and did not have a degree. How many of the applicants had at least 4 years experience and a degree ?

Correct Answer: 14
ধরি, সংখ্যাটি x ∴ 13x - x = 180 ⇒ 12x = 180 ⇒ x = 18012 ∴ x = 15