Square Root and Cube Root problems
- 1. A certain number of people agree to subscribe as many rupees each as a there are subscribers. The whole subscription is 2582449 rupees. Find the number of subscribers.
Options- A. 1607
- B. 1291
- C. 1503
- D. 1603 Discuss
Correct Answer: 1607
Explanation:
Let the total number of subscribers be x.
Then, according to the question, x2 = 2582449
? x = ?2582449
= 1607
- 2. Find the least number by which 175760 be devided to make it a perfect cube.
Options- A. 10
- B. 20
- C. 100
- D. 5 Discuss
Correct Answer: 10
Explanation:
175760 = 24 x 5 x 13 3
= 23 x 2 x 5 x 133
To make perfect cube, it must be divided by 2 x 5 = 10
- 3. The student of class XI of a school donated 4356 Rupees in all, for Prime Minister's National Relief Fund. Each student donated as many rupees as the number of students in the class. Find the number of students in the class.
Options- A. 65
- B. 60
- C. 66
- D. 70 Discuss
Correct Answer: 66
Explanation:
Total money donated = 4356 rupees
As total students are equal to the sum donated by each student.
Total Students =?4356
= 66
- 4. If ? 256 / ? x = 2, then x is equal to?
Options- A. 64
- B. 128
- C. 512
- D. 1024 Discuss
Correct Answer: 64
Explanation:
?256 / ?x = 2
? 16 = 2?x
? ?x = 8
? x = 64.
- 5. If N = 11 9/ 16 then ? N =?
Options- A. 13/4
- B. 11/4
- C. 1.125
- D. None of these Discuss
Correct Answer: 11/4
Explanation:
N = 25/16
? ?N = ?25/16
= 5/4
= 11/4
- 6. If ? 2401 = ? 7x then, the value of x is?
Options- A. 3
- B. 4
- C. 5
- D. 6 Discuss
Correct Answer: 4
Explanation:
?2401 = ?7x
? 7x = 2401 = 74
? x = 4
- 7. What is the smallest number by which 3600 be divided to make it a perfect cube?
Options- A. 9
- B. 50
- C. 30
- D. 450 Discuss
Correct Answer: 450
Explanation:
3600 = 2 x 2 x 2 x 2 x 3 x 3 x 5 x 5.
To make it a perfect cube, the given number must be divided by 2 x 3 x 3 x 5 x 5 = 450
- 8. By what least number must 21600 be multiplied to make it a perfect cube?
Options- A. 6
- B. 10
- C. 30
- D. 60 Discuss
Correct Answer: 10
Explanation:
21600 = 6 x 6 x 6 x 10 x 10
To, make the given number a perfect cube, it must be multiplied by 10.
- 9. The sequence root of 0. 4 is
Options- A. 0.6
- B. 0.7
- C. 0.8
- D. 0.9 Discuss
Correct Answer: 0.6
Explanation:
?0.4
= ?4/9
= 2/3 = 0.666
= 0.6
- 10. Find the square root of 105 4/ 64.
Options- A. 151/4
- B. 1512/4
- C. 101/4
- D. 62/4 Discuss
Correct Answer: 101/4
Explanation:
?1054/64
= ?6724/64
= 82/8 = 41/4 = 101/4
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