40% of students in a class are smart. The rest are stupid. Half the students play sports and half don't. If 20% of the students are smart and play sports, what percent of the students are stupid and don't play sports’?
A. 30
B. 40
C. 50
D. 60
E. none
সঠিক উত্তরঃ
A.
30
Explanation:
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