Number system Practice Question and Answer

Q:

Ishita can read a newspaper in 'n' minutes. What part of the newspaper can she read in 7 minutes (n>7)

950 0

  • 1
    $${n\over7}$$
    Correct
    Wrong
  • 2
    $${7n^2}$$
    Correct
    Wrong
  • 3
    $${7n}$$
    Correct
    Wrong
  • 4
    $${7\over n}$$
    Correct
    Wrong
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Answer : 4. "$${7\over n}$$"

Q:

If 16 : X :: X: 196, find the positive value of x?

950 0

  • 1
    60
    Correct
    Wrong
  • 2
    62
    Correct
    Wrong
  • 3
    56
    Correct
    Wrong
  • 4
    64
    Correct
    Wrong
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Answer : 3. "56"

Q:

many times will the buttons of a typewriter be pressed to write the numbers 121 to 1346?

945 0

  • 1
    3675
    Correct
    Wrong
  • 2
    4018
    Correct
    Wrong
  • 3
    4021
    Correct
    Wrong
  • 4
    4025
    Correct
    Wrong
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Answer : 4. "4025"

Q:

3¹¹ + 3¹² + 3¹³ + 3¹⁴ is divisible by which of the following?

939 0

  • 1
    7
    Correct
    Wrong
  • 2
    8
    Correct
    Wrong
  • 3
    11
    Correct
    Wrong
  • 4
    14
    Correct
    Wrong
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Answer : 2. "8"

Q:

The average of six consecutive odd numbers is 26. Find the difference between the largest and the smallest of these numbers.

938 0

  • 1
    8
    Correct
    Wrong
  • 2
    16
    Correct
    Wrong
  • 3
    10
    Correct
    Wrong
  • 4
    12
    Correct
    Wrong
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Answer : 3. "10"

Q:

For what value of ‘y’, $$ {x^{2}+{1\over12}{x}+y^{2}}$$ is perfect square?

937 0

  • 1
    1/3
    Correct
    Wrong
  • 2
    1/12
    Correct
    Wrong
  • 3
    1/24
    Correct
    Wrong
  • 4
    1/6
    Correct
    Wrong
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Answer : 3. "1/24"

Q:

Evaluate 743 x 999.

935 0

  • 1
    74257
    Correct
    Wrong
  • 2
    784527
    Correct
    Wrong
  • 3
    724457
    Correct
    Wrong
  • 4
    742257
    Correct
    Wrong
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Answer : 4. "742257"

Q:

A number consists of two digits. If the number formed by interchanging the digits is added to the original number, the resulting number (i.e. the sum) must be divisible by

934 0

  • 1
    11
    Correct
    Wrong
  • 2
    9
    Correct
    Wrong
  • 3
    5
    Correct
    Wrong
  • 4
    3
    Correct
    Wrong
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Answer : 1. "11"
Explanation :

Let the number be 10x + y

After interchanging the digits,

the number obtained = 10y + x

According to the question,

Resulting number

= 10x + y + 10y + x

= 11x + 11y

= 11 (x + y)

which is exactly divisible by 11.

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