Find the missing term: 5, 10, 20, 40, 80, ? MCQ with Answer and Explanation

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Find the missing term: 5, 10, 20, 40, 80, ?

A. 150

B. 120

C. 140

D. 160

Answer: Option D

Solution (By JKSSB Mock Tests)

Each term is multiplied by 2: 5×2=10, 10×2=20, 20×2=40, 40×2=80, so next is 80×2=160.

This question belongs to: Reasoning Mental Reasoning

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Practice More Mental Reasoning Questions

Question #1

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Statements: No book is a pen. All pens are pencils. Conclusions: I. No book is a pencil. II. Some pencils are pens.

A. Both follow

B. Only II follows

C. Neither follows

D. Only I follows

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Correct Answer: Option B

Explanation:
No book is pen and all pens are pencils does not mean no book is pencil (pencils may include other things). Some pencils are pens follows by conversion. Only II.

This question belongs to: Reasoning Mental Reasoning

Question #2

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A, B, C, D, E, F and G are sitting in a row facing North. C is to the immediate right of D. F is fourth to the left of G. B is between A and F. E is between C and G. Who is sitting in the middle?

A. E

B. D

C. B

D. C

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Correct Answer: Option A

Explanation:
From clues: possible arrangement A B F D C E G or similar. Middle is 4th position. One valid is A B F D C E G → D in middle.

This question belongs to: Reasoning Mental Reasoning