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- Question
- A can finish a work in 15 days. B in 20 days and C in 25 days. All these three worked together and earned ? 4700. The share of C is
Options- A. ? 1200
- B. ? 1500
- C. ? 1800
- D. ? 2000
- Correct Answer
- ? 1200
ExplanationA's 1 day's work = 1/15
B's 1 day's work = 1/20
C's 1 day's work = 1/25
A, B and C worked together.
? (A + B + C)'s 1 day's work = (1/15) + (1/20) + (1/25)
= (20 + 15 + 12)/ 300
= 47/300
Days taken to complete work by A, B and C working together = 300/47
? Share of C = (1/25) x (300/47) x 47000
= ? 1200 - 1.
If, a + b + c = 0, the value of ( a 2 + b 2 + c 2 ) is bc ca ab
Options- A. 2
- B. 3
- C. 4
- D. 5 Discuss
- 2. 582, 605, 588, 611, 634, 617, 600?
Options- A. 634
- B. 611
- C. 605
- D. 600 Discuss
- 3. If A and B have n elements in common, how many elements do A × B and B × A have in common?
Options- A. n
- B. n3
- C. n2
- D. None of these Discuss
- 4. ABCD is a parallelogram and X, Y are the mid-points of sides AB and CD respectively. Then quadrilateral AXCY is a :
Options- A. parallelogram
- B. rhombus
- C. square
- D. rectangle Discuss
- 5. The least perfect square, which is divisible by each of 21, 36 and 66 is:
Options- A. 213444
- B. 214344
- C. 214434
- D. 231444 Discuss
- 6. Three year ago, the average age of a family of five members was 27 yr. The present average age is also 27 yr after the inclusion of a child into the family. Find the age of the child.
Options- A. 16 yr
- B. 12 yr
- C. 24 yr
- D. 20 yr. Discuss
- 7. Sugar at Rs. 15 per kg is mixed with sugar at Rs. 20 per kg in the ratio 2 : 3. Find the price per kg of the mixture?
Options- A. Rs. 18
- B. Rs. 16
- C. Rs. 17
- D. Rs. 19 Discuss
- 8.
If a + 1 = 1, then the value of a3 is : a
Options- A. ? 2
- B. 2
- C. ? 1
- D. 4 Discuss
- 9. The greatest number by which if 1657 and 2037 are divided the remainders will be 6 and 5 respectively, is?
Options- A. 127
- B. 235
- C. 260
- D. 305 Discuss
- 10. A number exceeds 20% itself by 40. The number is?
Options- A. 50
- B. 60
- C. 80
- D. 320 Discuss
More questions
Correct Answer: 3
Explanation:
Correct Answer: 634
Explanation:
Alternately 23 is added and 17 is subtracted from the terms. So, 634 is wrong.
Correct Answer: n2
Explanation:
NA
Correct Answer: parallelogram
Explanation:
Correct Answer: 213444
Explanation:
Now, 2772 = 2 x 2 x 3 x 3 x 7 x 11
To make it a perfect square, it must be multiplied by 7 x 11.
So, required number = 22 x 32 x 72 x 112 = 213444
Correct Answer: 12 yr
Explanation:
Total age of 5 memeber (3 yr ago) = 27 x 5 = 135 yr
Total age of 5 members (at present) = 135 + 5 x 3 = 150 yr.
Let the persent age of child = x
? 27 = (150 + x)/6
? x = 162 - 150 = 12 yr.
Correct Answer: Rs. 18
Explanation:
Correct Answer: ? 1
Explanation:
Correct Answer: 127
Explanation:
Required number = H.C.F of (1657 - 6) and (2037 - 5)
= H.C.F of 1651 and 2032
= 127
Correct Answer: 50
Explanation:
Let the required number be N.
Then, N - 20% of N = 40
? N - 20N/100 = 400
? 5N - N = 200
? N = 50
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