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- Question
In a division sum, the remainder is 0. As student mistook the divisor by 12 instead of 21 and obtained 35 as quotient. What is the correct quotient?
Options- A. 0
- B. 12
- C. 13
- D. 20
- Correct Answer
- 20
Explanation
Number = (12 x 35)Correct Quotient = 420 ? 21 = 20
- 1. Which one of the following is a prime number?
Options- A. 161
- B. 221
- C. 373
- D. 437
- E. None of these Discuss
- 2. The largest 4 digit number exactly divisible by 88 is:
Options- A. 9944
- B. 9768
- C. 9988
- D. 8888
- E. None of these Discuss
- 3. The smallest 6 digit number exactly divisible by 111 is:
Options- A. 111111
- B. 110011
- C. 100011
- D. 110101
- E. None of these Discuss
- 4. How many 3 digit numbers are divisible by 6 in all?
Options- A. 149
- B. 150
- C. 151
- D. 166 Discuss
- 5. What is the unit digit in the product (365 x 659 x 771)?
Options- A. 1
- B. 2
- C. 4
- D. 6 Discuss
- 6. On dividing a number by 357, we get 39 as remainder. On dividing the same number 17, what will be the remainder?
Options- A. 0
- B. 3
- C. 5
- D. 11 Discuss
- 7. In a division sum, the divisor is 10 times the quotient and 5 times the remainder. If the remainder is 46, what is the dividend?
Options- A. 4236
- B. 4306
- C. 4336
- D. 5336
- E. None of these Discuss
- 8. What is the unit digit in 7105?
Options- A. 1
- B. 5
- C. 7
- D. 9 Discuss
- 9. (1000)9? 1024 =?
Options- A. 10000
- B. 1000
- C. 100
- D. 10
- E. None of these Discuss
- 10. 106 x 106 - 94 x 94 =?
Options- A. 2400
- B. 2000
- C. 1904
- D. 1906
- E. None of these Discuss
Numbers problems
Search Results
Correct Answer: 373
Explanation:
√437 > 22
All prime numbers less than 22 are : 2, 3, 5, 7, 11, 13, 17, 19.
161 is divisible by 7, and 221 is divisible by 13.
373 is not divisible by any of the above prime numbers.
∴373 is prime.
Correct Answer: 9944
Explanation:
Largest 4-digit number = 9999
88) 9999 (113
88
----
119
88
----
319
264
---
55
---
Required number = (9999 - 55)
= 9944.
Correct Answer: 100011
Explanation:
The smallest 6-digit number 100000.
111) 100000 (900
999
-----
100
---
Required number = 100000 + (111 - 100)
= 100011.
Correct Answer: 150
Explanation:
Required numbers are 102, 108, 114, ... , 996
This is an A.P. in which a = 102, d = 6 and l = 996
Let the number of terms be n. Then,
a + (n - 1)d = 996
⟹ 102 + (n - 1) x 6 = 996
⟹ 6 x (n - 1) = 894
⟹ (n - 1) = 149
⟹ n = 150.
Correct Answer: 4
Explanation:
Unit digit in 3 4 = 1 ⟹ Unit digit in (3 4 ) 16 = 1
∴ Unit digit in 365 = Unit digit in [ (34)16 x 3 ] = (1 x 3) = 3
Unit digit in 659 = 6
Unit digit in 74 ⟹ Unit digit in (74)17 is 1.
Unit digit in 771 = Unit digit in [(74)17 x 73] = (1 x 3) = 3
∴ Required digit = Unit digit in (3 x 6 x 3) = 4.
Correct Answer: 5
Explanation:
Let x be the number and y be the quotient. Then,
x = 357 x y + 39
= (17 x 21 x y) + (17 x 2) + 5
= 17 x (21y + 2) + 5)
∴Required remainder = 5.
Correct Answer: 5336
Explanation:
Divisor = (5 x 46) = 230
| ∴ 10 x Quotient = 230 ⟹ = | 230 | = 23 |
| 10 |
Dividend = (Divisor x Quotient) + Remainder
= (230 x 23) + 46
= 5290 + 46
= 5336.
Correct Answer: 7
Explanation:
Unit digit in 7 105 = Unit digit in [ (7 4 ) 26 x 7 ]
But, unit digit in (74)26 = 1
∴ Unit digit in 7105 = (1 x 7) = 7
Correct Answer: 1000
Explanation:
| Given Exp. = | (1000)9 | = | (103)9 | = | (10)27 | = 10(27-24) = 103 = 1000 |
| 1024 | 1024 | 1024 |
Correct Answer: 2400
Explanation:
| 106 x 106 - 94 x 94 | = (106)2 - (94)2 |
| = (106 + 94)(106 - 94) [Ref: (a2 - b2) = (a + b)(a - b) ] | |
| = (200 x 12) | |
| = 2400. |
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