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- Question
- In a class, there are 80 students and their average marks in the annual examination are 40. If the average marks of passed students are 60 and average marks of failed students are 35, then find out the number of students who failed.
Options- A. 63
- B. 60
- C. 72
- D. 64
- Correct Answer
- 64
ExplanationLet the number of failed student = Y
? Number of passed student = 80 - Y
sum of marks of all students = sum of marks of passed students + sum of marks of failed students
80 x 40 = (80 - Y) x 60 + 35Y
? 3200 =4800 - 60Y + 35Y
? 25Y = 1600
? Y = 64
? Number of students who failed = 64 - 1. L.C.M of 3/4, 6/7, 9/8 is?
Options- A. 18
- B. 3
- C. 3/56
- D. 9/28 Discuss
- 2. A and B can do a piece of work in 8 days, B and C can do the same work in 12 days and A and C complete it in 8 days. In how many days A, B and C can complete the whole work,working together?
Options- A. 4
- B. 6
- C. 12
- D. 9 Discuss
- 3. A and B can do a piece of work in 6 and 12 days, respectively. They (both) will complete the work in how many days?
Options- A. 9 days
- B. 18 days
- C. 6 days
- D. 4 days Discuss
- 4. ? 64009 is equal to :
Options- A. 352
- B. 523
- C. 253
- D. 532 Discuss
- 5. The mean temperature of Monday to Wednesday was 37°C and of Tuesday to Thursday was 34°C. If the temperature on Thursday was 4/5 that of Monday, the temperature of Thursday was
Options- A. 35.5°C
- B. 34°C
- C. 36.5°C
- D. 36°C Discuss
- 6. 331, 482, 551, 263, 383, 242, 111?
Options- A. 263
- B. 383
- C. 242
- D. 111 Discuss
- 7. If the price of petrol is increased by 20% and subsequently by 40%. If the original price was Rs25 per litre then what is then the final price per litre?
Options- A. 42
- B. 45
- C. 48
- D. 40 Discuss
- 8. Let A = {1, 2, {3, 4}, 5}. Which of the following statements are true?
Options- A. {3, 4} ? A;
- B. {3, 4} ? A;
- C. {{3, 4}} ? A;
- D. {1, 3, 5} ? A. Discuss
- 9. Roshan bought 5 pants at ?25 each, 10 shirts at ? 50 each and 15 ties at ? 35 each. Find the average price of all the articles.
Options- A. ? 38.33
- B. ? 45
- C. ? 60
- D. ? 45.33 Discuss
- 10. 165, 195, 255, 285, .... 435
Options- A. 340
- B. 341
- C. 345
- D. 401 Discuss
More questions
Correct Answer: 18
Explanation:
L. C . M = ( L.C.M of 3, 6, 9 ) / (H.C.F of 4, 7, 8)
= 18 / 1
= 18
Correct Answer: 6
Explanation:
Efficiency of (A + B) = 12.5%
Efficiency of (B + C) = 8.33%
Efficiency of (C + A) = 12.5%
? Efficiency of [(A + B) + (B + C) + (C + A)] = 33.33%
? Efficiency of (A + B + C) = 16.66%
? No. of days Required by A, B and C together = 100/16.66 = 6 days
Correct Answer: 4 days
Explanation:
A's 1 day's work = 1/6
B's 1 day's work = 1/12
(A + B)'s 1 day's work = 1/6 + 1/12
= (2 + 1)/12 = 3/12 = 1/4
Hence, both will complete the work in 4 days.
Correct Answer: 253
Explanation:
NA
Correct Answer: 36°C
Explanation:
Temperature of (Mon + Tue + Wed) = 37 x 3 = 11°C
Temperature of (Tue + Wed + Thu) = 34 x 3 = 102°C
Temperature of (Mon - Thu) = 111°C - 102°C = 9°C
Temperature of [Mon - 4/5(Mon] = 9
Temperature of Monday = 9 x 5 = 45°C
? Temperature of Thursday = 45 x 4/5 = 36°C
Correct Answer: 383
Explanation:
In each number except 383, the product of first and third digit is the middle one.
Correct Answer: 42
Explanation:
Final Price = 25 x (1 + 20/100) x (1 + 40/100)
=Rs.25 x 1.2 x 1.4
= Rs. 42
Correct Answer: {3, 4} ? A;
Explanation:
NA
Correct Answer: ? 38.33
Explanation:
Here, n1 = 5, n2 = 10, n3 = 15, a1 = 25, a2 = 50, a3 = 35
According to the formula,
Average price = (n1a1 + n2a2 + n3a3) / (n1 + n2 + n3)
= (5 x 25 + 10 x 50 + 15 x 35) / (5 + 10 + 15)
= (25 + 100 + 105) / (1 + 2 + 3)
= 230/6
= ? 38.33
Correct Answer: 345
Explanation:
Series Pattern
(15 x 11), (15 x 13), (15 x 17), (15 x 19), (15 x 23), (15 x 29)
? Missing term = (15 x 23) = 345
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