Decimal Numbers Quiz Set 017

Advertisement


Your Score
Correct Answers:
Wrong Answers:
Unattempted:

Question 1

What is ${4.91^3 - 0.40^3}/{4.91^2 + 1.964 + 0.40^2}$?

 A

+4.51.

 B

+5.31.

 C

-5.31.

 D

-4.51.

Soln.
Ans: a

We know ${a^3 - b^3}/{a^2 + ab + b^2}$ is same as ${(a - b) × (a^2 + ab + b^2)}/{a^2 + ab + b^2}$ which is same as a - b. So we get a - b = 4.91 - 0.40 = 4.51.


Question 2

For what value of x would this expression be a perfect square: $8.88 × 8.88 + x × 8.88 + 0.2 × 0.2$?

 A

0.4.

 B

0.8.

 C

0.2.

 D

0.1.

Soln.
Ans: a

Comparing the given expression with $a^2 + 2 × a ×b + b^2 = (a + b)^2$, we see that if a = 8.88, and b = 0.2 then by inspection, x should be equal to 2b = 2 × 0.2 = 0.4.


Question 3

What is ${48 × 6.7 - 67 × 8.5}/7.3$?

 A

$-33{70/73}$.

 B

$+33{70/73}$.

 C

$-33{23/73}$.

 D

$+33{23/73}$.

Soln.
Ans: a

Observe that all fractional numbers are having one digit to the right of the dot. So we can cancel all the dots and get a plain expression: ${48 × 67 - 67 × 85}/73$ which equals ${-2479/73}$, which is same as: $-33{70/73}$


Question 4

What is $0.15966/0.02$?

 A

7.983.

 B

6.983.

 C

5.983.

 D

8.983.

Soln.
Ans: a

The given expression can be written as ${15966/2} × {100/100000}$ which is same as ${15966/2} × {1/1000}$, which is same as $7983 × {1/1000}$, which is same as 7.983


Question 5

What is ${31 × 8.8 - 27 × 3.2}/4.2$?

 A

$44{8/21}$.

 B

$44{5/21}$.

 C

$44{1/21}$.

 D

$44{11/21}$.

Soln.
Ans: a

Observe that all fractional numbers are having one digit to the right of the dot. So we can cancel all the dots and get a plain expression: ${31 × 88 - 27 × 32}/42$ which equals ${932/21}$, which is same as: $44{8/21}$


buy aptitude video tutorials


Creative Commons License
This Blog Post/Article "Decimal Numbers Quiz Set 017" 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