In a class, 120 students are male and 100 students are female. 25% of the male students and 20% of the female students are engineering student. 20% of the male engineering students and 25% of the female engineering students passed the final exam. What percentage of engineering students passed the exam?

এখানে, Male eng. student এর সংখ্যা (120×25%) = 30 জন Female eng. student এর সংখ্যা (100×20%) = 20 জন ∴ Total eng. student পাশ করেছে (30 + 20) = 50 জন Male eng. student পাশ করেছে (30×20%) = 6  জন। শতকরা পাশ করেছে 6 + 550×100 = 22%;