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- Question
- There are 200 question in a 3 hour examination. Among 200 question, 50 are Mathematics, 100 are from GK and 50 are from Sciences. Ram spent twice as much time on each Mathematics question for each other question. How many minute did he spend on Mathematics questions?
Options- A. 36
- B. 72
- C. 100
- D. 60
- Correct Answer
- 72
ExplanationLet Ram spends p minute on each Mathematics question.
According to the question.
50 x p + 100 x p/2 + 50 x p/2 = 3 x 60
p(50+ 50 + 25) = 180
? p = 180/125
? Required time = 50 x 180/125
? Required time = 2 x 180/5
? Required time = 2 x 36 = 72 min
Method 2
Let Ram spends a minute on each sciences and Gk questions.
According to the question,
50 x 2a + 150 x a = 3 x 60
100a + 150a = 180
250a = 180
a = 180/250
So total time spend on Mathematics question = 2a x 50 question
So total time spend on Mathematics question = 2 x 50 x 180/250 = 72 minutes - 1. 198.995 x 12.005 + 16.25 x 6.95 =?
Options- A. 2580
- B. 2550
- C. 2400
- D. 2500 Discuss
- 2. The face value of 8 in the numeral 458926 is?
Options- A. 8000
- B. 8
- C. 1000
- D. 458000 Discuss
- 3. 6, 9, 15, 21, 24, 28, 30?
Options- A. 25
- B. 21
- C. 24
- D. 30 Discuss
- 4. 6674 x 625 =?
Options- A. 4170160
- B. 4072360
- C. 4171050
- D. 4171250 Discuss
- 5. If ax + by = 6, bx ? ay = 2 and x 2 + y 2 = 4, then the value of ( a 2 + b 2) would be :
Options- A. 10
- B. 2
- C. 4
- D. 5 Discuss
- 6. What if the probability of getting a king or a queen in a single drawn from a pack of 52 cards?
Options- A. 1/26
- B. 1/13
- C. 2/13
- D. None of these Discuss
- 7. Find the 4th proportional to 4 , 16 and 7 ,
Options- A. 28
- B. 29
- C. 22
- D. 25 Discuss
- 8. Raj sold an item for ? 6384 and incurred a loss of 30%. At what price should he have sold the item to have gained a profit of 30%
Options- A. ? 14656
- B. ? 11856
- C. ? 13544
- D. cannot be determind Discuss
- 9. (2/3) x (6/8) x (2/3) x (3/4) =?
Options- A. 0.25
- B. 0.5
- C. 1.45
- D. 11.8 Discuss
- 10. The HCF and LCM of two natural numbers are 12 and 72, respectively. What is the difference between the two numbers, if one of the number is 24?
Options- A. 12
- B. 18
- C. 21
- D. 24 Discuss
More questions
Correct Answer: 2500
Explanation:
? = 198.995 x 12.005 + 16.24 x 6.95
= 199 x 12 +16 x 7 = 2388 + 112 = 2500
Correct Answer: 8
Explanation:
The face value of 8 in 458926 is 8
Correct Answer: 25
Explanation:
Each of the number except 28, is a multiple of 3.
Correct Answer: 4171250
Explanation:
6674 x 625 = 6674 x (5)4
= 6674 x (104/24
= 66740000/16 = 4171250
Correct Answer: 10
Explanation:
As we know that given in question,
ax + by = 6 ........................ (i)
bx ? ay = 2 ........................ (ii)
On squaring the both equation and adding,
a2 x2 + b2 y2 + 2abxy + b2 x2 + a2 y2 ? 2abxy = 36 + 4
? x2 (a2 + b2) + y2 (a2 + b2) = 40
? (a2 + b2) (x2 + y2) = 40
As per given question, x2 + y2 = 40 , Put this value in above equation, we will get
? (a2 + b2) × 4 = 40
? a2 + b2 = 10
Correct Answer: 2/13
Explanation:
Clearly, n (S) = 52, there are 4 kings and 4 queens
? P(E) = n (E) / n (S) = 8/52 = 2/13
Correct Answer: 28
Explanation:
Lat the 4th proportional = N
Then, 4 : 16 : : 7 : N
? 4/16 = 7/N
? 4N = 7 x 16
? N = (7 x 16)/4 = 7 x 4 = 28
Correct Answer: ? 11856
Explanation:
CP = 100/70 = x 6384 = ? 9120
To gain 30%, SP = 130% of 9120
SP = (130/100) x 9120 = ? 11856
Correct Answer: 0.25
Explanation:
(2/3) x (6/8) x (2/3) x (3/4) = 1/4 = 0.25
Correct Answer: 12
Explanation:
Second number = (LCM x HCF) / first number
= (72 x 12)/ 24 = 36
Difference between the two numbers
= 36 - 24 = 12
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