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Number Objective Questions and answer

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1.) If the number 5 * 2 is divisible by 6, then * =?

A. 2                                    B. 3

C. 6                                    D. 7

View Answer

Answer: Option A

Explanation:

6 = 3 x 2. Clearly, 5 * 2 is divisible by 2. Replace * by x.

Then, (5 + x + 2) must be divisible by 3. So, x = 2.


2.) The unit digit in the product (784 x 618 x 917 x 463) is:

A. 2                                   B. 3

C. 4                                   D. 5

View Answer

Answer: Option A

Explanation:

Unit digit in the given product = Unit digit in (4 x 8 x 7 x 3)

= (672) = 2


3.) If the number 653 xy is divisible by 90, then (x + y) = ?

A. 2                                    B. 3

C. 4                                    D. 6

View Answer

Answer: Option C

Explanation:

90 = 10 x 9

Clearly, 653xy is divisible by 10, so y = 0

Now, 653x0 is divisible by 9.

So, (6 + 5 + 3 + x + 0) = (14 + x) is divisible by 9. So, x = 4.

Hence, (x + y) = (4 + 0) = 4.


4.) A boy multiplied 987 by a certain number and obtained 559981 as his answer. If in the answer both 98 are wrong and the other digits are correct, then the correct answer would be:

A. 553681                           B. 555181

C. 555681                           D. 556581

View Answer

Answer: Option C

Explanation:

987 = 3 x 7 x 47

So, the required number must be divisible by each one of 3, 7, 47

==> 553681 (Sum of digits = 28, not divisible by 3)

==> 553181 (Sum of digits = 25, not divisible by 3)

==> 555681 are divisible by 3, 7, 47.


5.) The Difference between two number s 1365. When the larger number is divided by the smaller one the quotient is 6 and the remainder is 15. The smaller number is?

A. 240                                B. 270

C. 295                                D. 360

View Answer

Answer: Option B

Explanation:

Let the smaller number be x, then larger number = 1365 + x

Therefore 1365 + x = 6x + 15

5x = 1350 ==> x = 270

Required Number is 270.

 
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