Showing 1–10 of 21 questions
What is the missing number in the series: 2, 6, 12, 20, ?, 42
Explanation:
Series follows n(n+1): 1×2=2, 2×3=6, 3×4=12, 4×5=20, 5×6=30, 6×7=42
If a:b = 3:4 and b:c = 5:6, then a:b:c is:
A
15:20:24
B
3:4:5
C
15:12:24
D
10:15:18
Correct Answer:
A. 15:20:24
Explanation:
a:b = 3:4, b:c = 5:6. Multiply first by 5 and second by 4: a:b = 15:20, b:c = 20:24. So a:b:c = 15:20:24
In a class of 50 students, 30 study Math and 25 study Science. How many study both?
Explanation:
Using set theory: n(M∪S) = n(M) + n(S) - n(M∩S). 50 = 30 + 25 - n(M∩S). n(M∩S) = 5
If x² + 1/x² = 7, then x + 1/x is:
Explanation:
(x + 1/x)² = x² + 2 + 1/x² = 7 + 2 = 9. So x + 1/x = ±3
A man walks 5 km north, then 3 km east, then 5 km south. How far is he from his starting point?
A
3 km
B
5 km
C
8 km
D
13 km
Explanation:
After north and south movements (cancel out), he is only 3 km east of starting point
What is the angle between the hour hand and minute hand at 3:15?
A
6.5°
B
7.5°
C
8.5°
D
9.5°
Explanation:
At 3:15, minute hand at 3 (90°), hour hand at 3 + 15/60 × 30 = 97.5°. Difference = 7.5°
Statement: Some doctors are teachers. All teachers are educated. Conclusion: Some doctors are educated.
A
Follows
B
Does not follow
C
Partially follows
D
Cannot be determined
Correct Answer:
A. Follows
Explanation:
Since some doctors are teachers, and all teachers are educated, some doctors must be educated
If ROSE is coded as 6918, then NOSE is coded as:
A
1918
B
1968
C
1916
D
1915
Explanation:
R=6, O=9, S=1, E=8. So NOSE = 1-9-1-8 = 1918
If ORANGE is to FRUIT, then SHARK is to:
A
AQUATIC
B
ANIMAL
C
FISH
D
OCEAN
Explanation:
Orange is a type of fruit. Shark is a type of fish. This is a classification relationship
Look at this sequence: AZ, BY, CX, DW, ?
Explanation:
First letter advances (A→B→C→D→E), second letter reverses (Z→Y→X→W→V)
