Number system Practice Question and Answer

Q:

A number divided by 13 leaves a remainder 1 and if the quotient, thus obtained, is divided by 5, we get a remainder of 3. What will be the remainder if the number is divided by 65?

948 0

  • 1
    28
    Correct
    Wrong
  • 2
    16
    Correct
    Wrong
  • 3
    18
    Correct
    Wrong
  • 4
    40
    Correct
    Wrong
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Answer : 4. "40"
Explanation :

Let the least number be x

y = 5 × 1 + 3 = 8

x = 13 × 8 + 1 = 105

On dividing 105 by 65, remainder = 40

Q:

A number when divided by 6 leaves remainder 3. When the square of the same number is divided by 6, the remainder is : 

218 0

  • 1
    0
    Correct
    Wrong
  • 2
    1
    Correct
    Wrong
  • 3
    2
    Correct
    Wrong
  • 4
    3
    Correct
    Wrong
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Answer : 4. "3"
Explanation :

The remainder will be same.

On dividing 9 by 6, remainder = 3

On dividing 81 by 6, remainder = 3

Q:

A number when divided by 119, leaves a remainder of 19. If it is divided by 17, it will leave a remainder of: 

654 0

  • 1
    19
    Correct
    Wrong
  • 2
    7
    Correct
    Wrong
  • 3
    10
    Correct
    Wrong
  • 4
    2
    Correct
    Wrong
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Answer : 4. "2 "
Explanation :

On dividing the given number by 119, let k be the quotient and 19 as remainder.

Then, number = 119k + 19

= 17 × 7k + 17 × 1 + 2

= 17 (7k + 1) + 2

Hence, the given number when divided by 17, gives (7k + 1) as quotient and 2 as remainder.

Q:

How many natural numbers divisible by 7 are there between 3 and 200? 

800 0

  • 1
    28
    Correct
    Wrong
  • 2
    29
    Correct
    Wrong
  • 3
    27
    Correct
    Wrong
  • 4
    36
    Correct
    Wrong
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Answer : 1. "28 "
Explanation :

Number just greater than 3 which is divisible by 7 = 7

Number just smaller than 200 which is divisible by 7 = 196

Here, a = 7, an = 196,

d = 7, n = 8

a= a + (n –1)d

⇒196 = 7 + (n – 1) × 7

⇒ 

⇒ n = 27 + 1 = 28

Note : We can find the answer after dividing 200 by 7. The quotient is our answer.

Q:

Each member of a Picnic party contributed twice as many rupees as the total collection was Rs.3042. The number of members present in the party was 

784 0

  • 1
    2
    Correct
    Wrong
  • 2
    32
    Correct
    Wrong
  • 3
    42
    Correct
    Wrong
  • 4
    39
    Correct
    Wrong
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Answer : 4. "39"
Explanation :

Let the required number of persons be x.

According to the question, 2x2 = 3042

Or

or 

Q:

A number when divided by 296 gives a remainder 75. When the same number is divided by 37 the remainder will be: 

746 0

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

Let number (dividend) be X.

∴ X = 296 × Q + 75 where Q is the quotient and can have the values 1, 2, 3 etc.

= 37 × 8 × Q + 37 × 2 + 1

= 37 (8Q + 2) + 1

Thus we see that the remainder is 1.

[Remark : When the second divisor is a factor of the first divisor, the second remainder is obtained by dividing the first remainder by the second divisor.

Hence, divide 75 by 37, the remainder is 1].

Q:

When 1062, 1134 and 1182 are divided by the greatest number .x, the remainder in each case is y. What is the value of (x − y)?

244 0

  • 1
    17
    Correct
    Wrong
  • 2
    18
    Correct
    Wrong
  • 3
    16
    Correct
    Wrong
  • 4
    19
    Correct
    Wrong
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Answer : 2. "18"
Explanation :

The value of (x-y) will be 18

Q:

Two positive numbers differ by 1280. When the greater number is divided by the smaller number, the quotient is 7 and the remainder is 50. The greater number is:

214 0

  • 1
    1558
    Correct
    Wrong
  • 2
    1458
    Correct
    Wrong
  • 3
    1585
    Correct
    Wrong
  • 4
    1485
    Correct
    Wrong
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Answer : 4. "1485"
Explanation :

Given :- Two positive numbers differ by 1280 

When the greater number is divided by the smaller number The quotient is 7 and the remainder is 50 

Concept :- Dividend = Quotient × divisor + remainder 

Calculation :- Let greater number = a and Smaller number = b From question, ⇒ a - b = 1280 ....(1) Again from question, ⇒ a = 7b + 50 ....(2) 

Put the value of a from equation (2) into equation (1) ⇒ 7b + 50 - b = 1280 ⇒ 6b = 1280 - 50 ⇒ 6b = 1230 ⇒ b = (1230/6) ⇒ b = 205 

Put the value of b in equation (1) ⇒ a - 205 = 1280 ⇒ a = 1280 + 205 ⇒ a = 1485 ⇒ Greater number = 1485 ∴ Greater number is 1485

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