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Reasoning Ability

Critical thinking and logical reasoning questions

202 Q 1 Topics Take Test
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Difficulty: All Easy Medium Hard 111–120 of 202
Topics in Reasoning Ability
All Puzzles & Seating Arrangement 172
In a class of 40 students, some play cricket, some play football, and some play both. If 25 play cricket and 20 play football, how many play both?
A 10
B 5
C 15
D 8
Correct Answer:  B. 5
EXPLANATION

Using set theory: Total = Cricket + Football - Both. 40 = 25 + 20 - Both. Both = 45 - 40 = 5.

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If A is the brother of B, C is the daughter of B, D is the brother of C, then what is the relationship between A and D?
A Uncle
B Grandfather
C Cousin
D Cannot be determined
Correct Answer:  A. Uncle
EXPLANATION

A is brother of B, so B is A's sibling. C is daughter of B (A's sibling), and D is brother of C. Therefore, D is the child of B (A's sibling), making A the uncle of D.

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In a certain code language, MATHEMATICS is written as LZSGZLJBHRD. How is SCIENCE written in that code?
A RDHRMBD
B RDHNCBD
C SGHRNCB
D RDHNFBD
Correct Answer:  B. RDHNCBD
EXPLANATION

Each letter is shifted backward by 1 position in the alphabet. S→R, C→B, I→H, E→D, N→M, C→B, E→D. The pattern gives RDHNCBD.

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In a logic puzzle, 6 boxes are arranged left to right. Red box is 3 positions from left. Green is 2 right of Yellow. Blue is immediate left of Red. If there are only 4 colors, where is Yellow?
A 1st position
B 2nd position
C 4th position
D 5th position
Correct Answer:  A. 1st position
EXPLANATION

Red at 3, Blue at 2. Green 2 right of Yellow: if Yellow at 1, Green at 3. But Red at 3. If Yellow at 4, Green at 6. This works: Blue(2), Red(3), Yellow(4), Green(6). Yellow at position 4... Rechecking: Yellow could be at 1 if Green at 3, but Red there. So Yellow at 4.

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Complete the series: 3, 12, 27, 48, 75, __
A 105
B 108
C 110
D 115
Correct Answer:  B. 108
EXPLANATION

Pattern: 3×1=3, 3×4=12, 3×9=27, 3×16=48, 3×25=75, 3×36=108. Multiply 3 by perfect squares.

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All doctors are intelligent. Some intelligent people are rich. Conclusion: Some doctors are rich. Is this conclusion valid?
A Valid
B Invalid
C Probably valid
D Uncertain
Correct Answer:  B. Invalid
EXPLANATION

Doctors are intelligent, but not necessarily among the 'some intelligent people who are rich.' The conclusion is logically invalid.

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Seven students P, Q, R, S, T, U, V stand in a line. T is 4th from left. P is 2 positions to the left of T. V is 2nd from right. Q is between P and S. Where is R?
A 6th position
B 5th position
C 7th position
D 3rd position
Correct Answer:  A. 6th position
EXPLANATION

T at 4, P at 2, V at 6 (2nd from right in 7). Q between P(2) and S: possibly 3. Remaining: R at 5 or 7. V at 6 means R at 5 or 7. Given Q between P and S, arrangement: P-Q-S-T-?-V-R gives R at 6, or P-Q-S-T-R-V-U gives R at 5. Correcting: R at position 6.

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In a code, STABLE is written as 19-20-1-2-12-5. How is MOBILE written?
A 13-15-2-9-12-5
B 13-14-2-9-12-5
C 12-15-2-9-12-5
D 13-15-2-8-12-5
Correct Answer:  A. 13-15-2-9-12-5
EXPLANATION

Code uses A=1, B=2... Z=26. M=13, O=15, B=2, I=9, L=12, E=5. MOBILE = 13-15-2-9-12-5.

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Five people A, B, C, D, E have different heights. C is taller than D but shorter than A. B is taller than E. A is taller than B. Who is the second tallest?
A A
B B
C C
D Cannot be determined
Correct Answer:  D. Cannot be determined
EXPLANATION

Order: A > C > D and A > B > E. Without knowing relationship between C and B exactly, second tallest cannot be definitively determined.

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TALL : LLAT :: BRIGHT : ?
A THGIRB
B HTIGR
C THGIB
D THGIB
Correct Answer:  A. THGIRB
EXPLANATION

TALL reversed = LLAT. BRIGHT reversed = THGIRB.

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