Problems on Numbers Quiz Set 020

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Question 1

The sum of three consecutive odd integer numbers is -2313. The middle among the three is?

 A

-771.

 B

-770.

 C

-768.

 D

-769.

Soln.
Ans: a

Let the numbers be 2n - 3, 2n - 1 and 2n + 1. The sum is 3(2n - 1) = 3 x middle. We are given 3 x middle = -2313, ⇒ middle = $-2313/3$, i.e., middle = -771.


Question 2

What is the digit at units place: 1626 × 1947 × 8850?

 A

0.

 B

1.

 C

3.

 D

2.

Soln.
Ans: a

The digit at units place = (last digit of 1626) × (last digit of 1947) × (last digit of 8850) = 6 × 7 × 0 = 0, which = 0.


Question 3

x should be replaced by which minimum number so that 4618521x98 is completely divisible by 3?

 A

1.

 B

2.

 C

4.

 D

3.

Soln.
Ans: a

If the above number has to be divisible by 3, the sum of the digits, i.e., 4 + 6 + 1 + 8 + 5 + 2 + 1 + x + 9 + 8, should be divisible by 3. So we can see that $x + 44$ should be divisible by 3. By inspection, x = 1.


Question 4

If  $x/7 = y/19 = z/24$, then ${x + y + z}/x$ = ?

 A

$7{1/7}$.

 B

$9{1/2}$.

 C

$4{7/9}$.

 D

$7{8/9}$.

Soln.
Ans: a

Let $x/7 = y/19 = z/24$ = k. Then ${x + y + z}/x$ is same as ${7k + 19k + 24k}/{7k}$ which equals $7{1/7}$.

${50/7}$ is same as $7{1/7}$.


Question 5

The sum of three consecutive integer numbers is 696. The smallest of the three is?

 A

231.

 B

232.

 C

230.

 D

233.

Soln.
Ans: a

Let the numbers be n - 1, n and n + 1. The sum is 3n. We are given 3n = 696, ⇒ n = $696/3$, i.e., n = 232. So the smallest is 231.


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Creative Commons License
This Blog Post/Article "Problems on Numbers Quiz Set 020" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2017-04-07.

Posted by Parveen(Hoven),
Aptitude Trainer


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