Decimal Numbers Quiz Set 003

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Question 1

What is x in $0.41/x = 4.1$?

 A

0.1.

 B

1.0.

 C

0.01.

 D

0.001.

Soln.
Ans: a

The expression becomes $x = {41/41} × {10/100}$ = 0.1.


Question 2

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 3

Which is the smallest?

 A

$0.077^3$.

 B

$1/0.077$.

 C

$0.077$.

 D

$0.077^2$.

Soln.
Ans: a

We know that if a number is less than 1, then it becomes smaller and smaller as it is raised to higher and higher positive powers. Now, $1/0.077$ is same as $0.077^{-1}$. The three powers of 0.077 given to us are -1, 1, 2 and 3. Out of these 3 is the most positive, so, $0.077^3$ is the smallest.


Question 4

What is ${2.44^2 - 1.86^2}/{2.44 - 1.86}$?

 A

+4.30.

 B

+0.58.

 C

-4.30.

 D

-0.58.

Soln.
Ans: a

We know $a^2 - b^2$ = $(a - b) × (a + b)$. So ${a^2 - b^2}/{a - b}$ is same as a + b. We get a + b = 2.44 + 1.86 = 4.30.


Question 5

What is z in $9.477 + 0.2 - z = 0.02$?

 A

9.657.

 B

8.657.

 C

9.756.

 D

8.756.

Soln.
Ans: a

z = (0.2 + 9.477) - 0.02 = 9.657.


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Creative Commons License
This Blog Post/Article "Decimal Numbers Quiz Set 003" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2017-08-12.

Posted by Parveen(Hoven),
Aptitude Trainer


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