In a class of 80 students, 45 study Maths, 40 study Physics, and 15 study both. How many study exactly one subject? MCQ with Answer and Explanation

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In a class of 80 students, 45 study Maths, 40 study Physics, and 15 study both. How many study exactly one subject?

A. 55

B. 50

C. 65

D. 60

Answer: Option A

Solution (By JKSSB Mock Tests)

Only Maths = 45−15=30; only Physics = 40−15=25. Exactly one = 30+25=55.

This question belongs to: Reasoning Logical Reasoning

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Question #1

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If 12th January 2008 was a Saturday, what day of the week was 12th January 2009?

A. Wednesday

B. Sunday

C. Monday

D. Tuesday

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Correct Answer: Option C

Explanation:
2008 leap year, from Jan 12 2008 to Jan 12 2009 includes Feb 29, so +2 days. Saturday +2 = Monday.

This question belongs to: Reasoning Logical Reasoning

Question #2

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In a class of 50 students, 30 play cricket, 20 play football, and 10 play both. How many play neither?

A. 20

B. 15

C. 10

D. 5

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Correct Answer: Option C

Explanation:
Total who play at least one = 30+20−10 = 40. Neither = 50−40 = 10.

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Question #3

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Statements: All books are novels. Some novels are stories. Conclusions: I. Some stories are books. II. Some novels are books.

A. Neither follows

B. Both follow

C. Only II follows

D. Only I follows

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Correct Answer: Option C

Explanation:
All books novels means some novels are books. No definite stories and books.

This question belongs to: Reasoning Logical Reasoning

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