Showing 451–460 of 654 questions
What is the average of first 20 natural numbers?
Explanation:
Sum of first n natural numbers = n(n+1)/2. Sum = 20×21/2 = 210. Average = 210/20 = 10.5
A person walks 6 km North, then 8 km East. What is the shortest distance from the starting point?
A
10 km
B
14 km
C
12 km
D
9 km
Explanation:
Using Pythagorean theorem: Distance = √(6² + 8²) = √(36 + 64) = √100 = 10 km
If A:B = 3:4 and B:C = 5:6, what is A:B:C?
A
15:20:24
B
3:4:5
C
3:5:6
D
12:16:20
Correct Answer:
A. 15:20:24
Explanation:
A:B = 3:4 (multiply by 5) = 15:20. B:C = 5:6 (multiply by 4) = 20:24. So A:B:C = 15:20:24
A mixture contains milk and water in the ratio 5:3. If the total quantity is 80 liters, how much milk is there?
A
40 liters
B
50 liters
C
60 liters
D
30 liters
Correct Answer:
B. 50 liters
Explanation:
Milk:Water = 5:3, Total parts = 8. Milk = 5/8 × 80 = 50 liters
A number increased by 25% becomes 500. What is the original number?
Explanation:
Let original number = x. x × 1.25 = 500. x = 500/1.25 = 400
Find the LCM of 12, 18, and 24.
Explanation:
12 = 2² × 3, 18 = 2 × 3², 24 = 2³ × 3. LCM = 2³ × 3² = 8 × 9 = 72
If all roses are flowers and some flowers are red, which conclusion is valid?
A
All roses are red
B
Some roses are red
C
All red things are flowers
D
None of the above
Correct Answer:
D. None of the above
Explanation:
We cannot conclude that some roses are red because we don't know if the red flowers include roses or not
Find the odd one out: 15, 20, 25, 30, 35, 40, 45, 55
Explanation:
All numbers except 55 are multiples of 5 with a difference of 5. The difference before 55 is 10 instead of 5
MORNING is to NIGHT as SPRING is to ?
A
AUTUMN
B
FALL
C
WINTER
D
SUMMER
Correct Answer:
C. WINTER
Explanation:
Morning and Night are opposites. Spring and Winter are opposite seasons
If you rearrange the letters of 'STOP', you can make another word. Which word cannot be made?
A
POTS
B
TOPS
C
POST
D
SPOT
Explanation:
POST requires two different letters not in STOP (needs T, O, P, S but POST needs different arrangement). All others are valid anagrams
