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Playing with Numbers

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The difference in the place value of 5 and 2 in 48520 is

  1. 500

  2. 480

  3. 520

  4. 490

  5. None of these


Correct Option: B
Explanation:

Difference = 500 - 20 = 480

Solve: - (5 + 3 + 2 - 1)

    • 7
  1. 10

  2. 9

    • 5
  3. None of these


Correct Option: C
Explanation:

5 + 3 + 2 - 1 = 9

What is the least 5-digit number that can be formed using the digits 1, 0, 5, 2, 9?

  1. 01529

  2. 01259

  3. 10259

  4. 10529

  5. None of these


Correct Option: C
Explanation:

Correct

Which of the following numbers is 3 more than - 2?

  1. 1

    • 5
  2. 5

    • 1
  3. 0


Correct Option: A
Explanation:

3 + (- 2 ) = 1 The required number is 1.

Which of the following numbers are co-prime?

  1. 11, 13

  2. 11, 22

  3. 12, 44

  4. 66, 33

  5. 5, 15


Correct Option: A
Explanation:

Co-primes are the numbers having only '1' as a common factor.  Their only common factor is 1.

What is the value of the expression [ - 3 - (- 5) + ( - 1 + 2) - 7]?

  1. 2

  2. 16

  3. 14

    • 4
  4. None of these


Correct Option: D
Explanation:

= 2 +1- 7 = -4

If the additive insverse of - 12 is x, 0 is y and 4 is z, then the value of (x + y - z) is

  1. 8

  2. 16

    • 8
  3. 17

  4. None of these


Correct Option: B
Explanation:

12 + 0 - (-4) = 16

If k is the solution of the linear equation 2x + 3 = 5 and t is the solution of the linear equation 4 x + 4 = 5x + 1, then the value of (k + 2t - 3) is

  1. 10

  2. 4

  3. 2

    • 8
  4. None of these


Correct Option: B
Explanation:

k = 1, t = 3 k +2t -3 = 1 + 6 - 3 = 4

Which of the following numbers has three different prime factors?

  1. 60

  2. 16

  3. 27

  4. 125

  5. None of these


Correct Option: A
Explanation:

60 = 2 X 3 X 5 X 2

Which of the following numbers has the lowest value?

1.00160, 1.00610, 1.00060, 1.00170, 1.00710

  1. 1.00160

  2. 1.00610

  3. 1.00060

  4. 1.00170

  5. 1.00710


Correct Option: C
Explanation:

The lowest number is 1.00060.

If k is 2% of 8 and l is 1% of 10, then the value of k + l is

  1. 0.06

  2. 0.26

  3. 0.17

  4. 0.16

  5. None of these


Correct Option: B
Explanation:

k = 8 (2/100) = 16/100 l = 10 (1/100) = 10/100  k + l = (16/100) + (10/100) = 26/100 = 0.26

If x = 1, y = 2 and z = 0, then the value of 3(x.y + y.z + x.z) + x is

  1. 2

  2. 6

  3. 4

  4. 7

  5. None of these


Correct Option: D
Explanation:

3{(x.y + y.z + x.z)} + 1 = 3{(1) (2) + (2) (0) + (1) (0)} + 1 = 3 X 2 + 1 = 6 + 1 = 7

What is the value of the expression [2 + 3 { 2 + 3 X 2 - 4}]?

    • 10
  1. 20

  2. 14

  3. 60

  4. None of these


Correct Option: C
Explanation:

[2 + 3{ 2 + 3 X 2 - 4}] = [2 + 3{ 2 + 6 - 4 }] = [2 + 3{8 - 4}] = [2 + 3 X 4] = [2 + 12] = 14

A ribbon has length 27 cm. The ribbon is to be cut in the ratio 2 : 3 : 4. What are the respective lengths of the parts of the ribbon?

  1. 3 cm, 9 cm and 15 cm

  2. 3 cm, 6 cm and 18 cm

  3. 6 cm, 9 cm and 12 cm

  4. 3 cm, 7 cm and 17 cm

  5. None of these


Correct Option: C
Explanation:

Let the lengths of the ribbons be 2k, 3k and 4k, respectively. Now, 2k + 3k + 4k = 27    9k = 27  k = 3 cm Therefore, 2k = 6 cm, 3k = 9 cm and 4k = 12 cm.

Which of the following numbers is/are not divisible by 2?

  1. 256478

  2. 546323

  3. 236940

  4. 1, 2 and 3

  5. Only 1 and 2


Correct Option: B
Explanation:

It is not divisible by 2.

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