Problems on Numbers Quiz Set 004

Advertisement


Your Score
Correct Answers:
Wrong Answers:
Unattempted:

Question 1

The sum of two numbers is 10. Their product is 9. One of the two numbers is?

 A

9.

 B

10.

 C

8.

 D

11.

Soln.
Ans: a

Let the numbers be $a$ and $10 - a$. We are given their product as a × (10 - a) = 9, which is a quadratic expression that can be simplified to $(a - 9) × (1 - a) = 0$. So the numbers could be 9 and 1.


Question 2

What is x in $1{19/x}$ × $5{12/17}$ = $5{11/14}$?

 A

1358.

 B

1359.

 C

1357.

 D

1360.

Soln.
Ans: a

We can see that $1{19/x}$ = ${81/14}$ × ${17/97}$. ⇒ ${1x + 19}/x$ = ${1377/1358}$ ⇒ x = 1358.


Question 3

x should be replaced by which minimum number so that 936219x862 is completely divisible by 3?

 A

2.

 B

3.

 C

5.

 D

4.

Soln.
Ans: a

If the above number has to be divisible by 3, the sum of the digits, i.e., 9 + 3 + 6 + 2 + 1 + 9 + x + 8 + 6 + 2, should be divisible by 3. So we can see that $x + 46$ should be divisible by 3. By inspection, x = 2.


Question 4

How many odd numbers are there between -1270 and 1358?

 A

1314.

 B

1315.

 C

1313.

 D

1316.

Soln.
Ans: a

Odd numbers are in an AP. First term $a = -1269$, common difference $d = 2$, the last term $t_n$ is given as 1357. By the AP formula, $1357 = -1269 + (n - 1) × 2$ ⇒ $n = 1 + {{1357 - (-1269)}/2} = 1314$.


Question 5

Which term of this arithmetic series is zero: 70, 63, 56 ...?

 A

11.

 B

12.

 C

10.

 D

13.

Soln.
Ans: a

The first term is 70, common difference is d = -7, n-th term is 0. So $0 = 70 + (n - 1) × -7$ which gives $n = 1 + {70/7} = 11$.


buy aptitude video tutorials


Creative Commons License
This Blog Post/Article "Problems on Numbers Quiz Set 004" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2017-05-17.

Posted by Parveen(Hoven),
Aptitude Trainer


Advertisement