Discussion
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- Question
- 10.8 x 5.5 x 8.4 =?
Options- A. 458.69
- B. 489.96
- C. 498.96
- D. 485.69
- Correct Answer
- 498.96
ExplanationMultiply the given in question.
The answer would be
? = 10.8 x 5.5 x 8.4 = 498.96 - 1. Simplify 6 - [9 - {18 - (15 -12 - 9)}]
Options- A. 1
- B. 4
- C. 5
- D. 3 Discuss
- 2. Find the value of a 3 + b 3 + c 3 - 3abc when a = 225, b = 226 , c = 227
Options- A. 2304
- B. 2430
- C. 2034
- D. 2340 Discuss
- 3. If x = ?3 + ?2 , then the value of (x + 1/x) is
Options- A. 2
- B. 3
- C. 2?2
- D. 2?3 Discuss
- 4. In a certain office (1/3) of the worker are women (1/2) of the women are married and (1/3) of the married women have children. If (3/4) of the man are married and (2/3) of the married men have children. What part of workers are without children?
Options- A. 5/11
- B. 4/9
- C. 11/18
- D. 17/36 Discuss
- 5. (2 - 1/3) (2 - 3/5) (2 - 5/7) ... (2 - 997/999) is equal to?
Options- A. 1001/999
- B. 999/1001
- C. 1001/3
- D. 5/1001 Discuss
- 6. 8648 - 7652 =? x 40
Options- A. 24.7
- B. 28.9
- C. 27.4
- D. 25.9 Discuss
- 7. 683.46 - 227.39 - 341.85 =?
Options- A. 114.22
- B. 141.22
- C. 144.22
- D. 112.22 Discuss
- 8. Mohan gets 3 marks for each correct sum and loses 2 marks for each wrong sum. He attempts 30 sums and obtains 40 marks. The number of sums solved correctly is
Options- A. 25
- B. 10
- C. 15
- D. 20 Discuss
- 9. It is required to get 40% marks to qualify an exam. A candidate scored 200 marks and failed by 8 marks. What were the maximum marks of that exam?
Options- A. 520
- B. 540
- C. 502
- D. Couldn't be determined Discuss
- 10. One-third of Rahul's marks in Mathematics exceeds one-half of his marks in Hindi by 30. If he got 480 marks in the two subjects together, how many marks did he get in Hindi ?
Options- A. 200
- B. 294
- C. 156
- D. 196 Discuss
Simplification problems
Search Results
Correct Answer: 3
Explanation:
Given expression
= 6 - [9 - {18 - (15 -12 - 9)}]
= 6 - [9 - {18 - (15 - 12 + 9)}]
= 6 - [9 - {18 - 12}]
= 6 - [9 - 6] = 6 - 3 = 3
Correct Answer: 2034
Explanation:
We know that,
a3 + b3 + c3 - 3abc
= (a + b + c) 1/2 [(a - b) 2 + (b - c) 2 + (c - a) 2]
= (225 + 226 + 227) 1/2 [1 + 1 + 4]
= 678 x 3 = 2034
Correct Answer: 2?3
Explanation:
Given , X = ?3 + ?2
? 1/x = 1/(?3 + ?2)
Now Multiply and Divide by (?3 - ?2) in 1/x.
After multiply and divide, we will get
1/x = (1/(?3 + ?2)) X (?3 - ?2) /(?3 - ?2)
[rationalising]
? 1/x = ?3 - ?2/3 - 2
? x + 1/x = ?3 + ?2 + ?3 - ?2 = 2?3
Correct Answer: 11/18
Explanation:
Let, total number of workers be N .
Then number of women = N/3
Number of men = 2N/3
Number of women having children = 1/3 of 1/2 of N/3 = N/18
Number of men having children = 2/3 of 3/4 of 2N/3 = N/3
Number of workers having children = N/18 + N/3 = 7N/18
Number of workers having no children = N - 7N/18 = 11N/18
=11/18 of all workers
Correct Answer: 1001/3
Explanation:
Given expression
= (2 - 1/3) (2 - 3/5) (2 - 5/7) ... (2 - 997/999)
= ((6 - 1)/3) ((10 - 3)/5) ((14 - 5)/7) ... ((1998 - 997)/999)
= 5/3 x 7/5 x 9/7 x ... x 1001/999
Multiply and solve by using the law of algebra,
= 5/3 x 7/5 x 9/7 x ... x 1001/999
= 1001/3
Correct Answer:
Explanation:
8648 - 7652 = ? x 40
996 = ? x 40 ? ? = 996/40 = 24.9
Correct Answer: 114.22
Explanation:
? = 683.46 - 227.39 - 341.85
= 683.46 - 569.24 = 114.22
Correct Answer: 20
Explanation:
Solution 1.
Let the question solved correctly by Mohan = X ;
and number of question solved wrongly by Mohan = 30 - X ;
According to the question,
3X - (30 - X) x 2 = 40
? 3x - 60 + 2x = 40
? 5x - 60 = 40
? 5x = 40 + 60 ? x = 100/5 = 20
? Mohan attempted 20 questions correctly .
Solution 2.
Let the question solved correctly by Mohan = X ;
and number of question solved wrongly by Mohan = Y ;
According to given question;
X + Y = 30 ; -----------i
3X - 2Y = 40 ;-------ii
Now multiply the first equation by 2;
we will get
2X + 2Y = 60 ;--------iii
After Add the equation ii and iii , we will get
3X - 2Y + 2X + 2Y = 40 + 60 ;
? 5X = 100 ;
? X = 20;
? Mohan attempted 20 questions correctly .
Correct Answer: 520
Explanation:
Let the maximum marks = x.
According to the question,
40x/100 = 200 + 8
? x = 208 x 10/4 = 520
Correct Answer: 156
Explanation:
Let Rahul's marks in Mathematics = x
and in Hindi = y
According to the question,
1/3 x - 1/2y = 30
? 2x - 3y = 180 ...(i)
Also, given
x + y = 480 ...(ii)
By solving Eqs. (i) and (ii), we get
x = 324
and y =156
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