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- Question
- The sum of the digits of a two digit number is 10, when the number is reversed, the number increases by 72.Find the number.
Options- A. 64
- B. 82
- C. 19
- D. 37
- Correct Answer
- 19
ExplanationBy checking options
91-19=72
Or
Let the number be xy
So 10x + y = 10 ..... (i)
When the number is reversed the new number is yx
So (10y + 10 ) - ( 10x +y ) = 72 ....(ii)
From Eqs. (i) & (ii)
x = 1 and y =9
?number = 19 - 1. The last digit of the number obtained by multiplying the numbers 41 x 42 x 43 x 44 x 45 x 46 x 47 x 48 x 49 will be?
Options- A. 0
- B. 1
- C. 4
- D. 5 Discuss
- 2. 3, 7, 15, 27, 63, 127, 255
Options- A. 7
- B. 15
- C. 27
- D. 63
- E. 127 Discuss
- 3. 2880, 480, 92, 24, 8, 4, 4
Options- A. 480
- B. 92
- C. 24
- D. 8
- E. 4 Discuss
- 4. 10, 26, 74, 218, 654, 1946, 5834
Options- A. 26
- B. 74
- C. 218
- D. 654
- E. 1946 Discuss
- 5. 15, 16, 34, 105, 424, 2124, 12756
Options- A. 16
- B. 34
- C. 105
- D. 424
- E. 2124 Discuss
- 6. Find the product of place value and face value of 5 in 65231
Options- A. 28000
- B. 25000
- C. 27000
- D. 26000 Discuss
- 7. The units digit in the product ( 784 x 618 x 917 x 463 ) is
Options- A. 2
- B. 3
- C. 4
- D. 5 Discuss
- 8. If 1x5x01 is divisible by 11, then the value of x is
Options- A. 6
- B. 4
- C. 8
- D. 9 Discuss
- 9. The pair of numbers which are relatively prime to each other is
Options- A. (68, 85)
- B. (65, 91)
- C. (92, 85)
- D. (102, 153) Discuss
- 10. When 121012 is divided by 12, the remainder is
Options- A. 0
- B. 2
- C. 3
- D. 4 Discuss
Number System problems
Search Results
Correct Answer: 0
Explanation:
Last digit will be multiplication of 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9.
It includes 5 & 2.
So, 5 x 2=10,
0 will be the last digit.
Correct Answer: 27
Explanation:
So, 27 is wrong.
Correct Answer: 92
Explanation:
Clearly, 92 is wrong.
Correct Answer: 654
Explanation:
3rd term = (2nd term) x 3 - 4 = 26 x 3 - 4 = 74.
4th term = (3th term) x 3 - 4 = 74 x 3 - 4 = 218.
5th term = (4th term) x 3 - 4 = 218 x 3 - 4 = 650.
∴ 5th term must be 650 instead of 654.
Correct Answer: 2124
Explanation:
3rd term = (2nd term) x 2 + 2 = 16 x 2 + 2 = 34.
4th term = (3th term) x 3 + 3 = 34 x 3 + 3 = 105.
5th term = (4th term) x 4 + 4 = 105 x 4 + 4 = 424
6th term = (5th term) x 5 + 5 = 424 x 5 + 5 = 2125
∴ 6th term should 2125 instead of 2124.
Correct Answer: 25000
Explanation:
Place value of 5 in 65231 = 5 x 1000
= 5000
Face value = 5
required product = 5000 x 5 = 25000
Correct Answer: 2
Explanation:
Units digit in the given product = Units digit of 4 x 8 x 7 x 3
= Units digit of 672
= 2
Correct Answer: 8
Explanation:
When a number is divisible by 11, then sum of numbers at even place - sum of numbers at odd place = 0 or divisible by 11.
( x + x + 1 ) - ( 1+ 5 + 0 ) = 11
? 2x - 5 = 11
? x = 8
Correct Answer: (92, 85)
Explanation:
92 and 85 are coprime numbers because their HCF is 1.
Correct Answer: 4
Explanation:
121012 = 12 x 10084 + 4
? remainder = 4
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