Find the odd one out: 10, 20, 30, 45, 50 MCQ with Answer and Explanation

Find the odd one out: 10, 20, 30, 45, 50
A. 20
B. 30
C. 45
D. 50
Answer: Option C
Solution (By JKSSB Mock Tests)
All others are exact multiples of 10; 45 is not divisible by 10.

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Practice More Mental Reasoning Questions

Question #1
In a certain code language, 'COMPUTER' is written as 'RFUVQNPC'. How will 'MEDICINE' be written in that code?
A. EOJDJEFM
B. MFEDJJOE
C. MFEJDJOE
D. EOJDEJFM

Correct Answer: Option A


Explanation:
The letters are reversed and then each letter is increased by 1. COMPUTER reversed is RETUPMOC, then +1 gives RFUVQNPC. MEDICINE reversed is ENICIDEM, then +1 gives EOJDJEFM.

This question belongs to: Reasoning Mental Reasoning
Question #2
In a code, TEACHER is written as VGCEJGT. How is STUDENT written in that code?
A. UWVFGPV
B. UVWFPGV
C. UVWFGOW
D. UVWFGPV

Correct Answer: Option D


Explanation:
Each letter is shifted 2 places forward. S+2=U, T+2=V, U+2=W, D+2=F, E+2=G, N+2=P, T+2=V.

This question belongs to: Reasoning Mental Reasoning
Question #3
Find the missing term: 80, 40, 20, 10, ?
A. 5
B. 2
C. 8
D. 4

Correct Answer: Option A


Explanation:
Each term is divided by 2: 80÷2=40, 40÷2=20, 20÷2=10, so next is 10÷2=5.

This question belongs to: Reasoning Mental Reasoning