Decimal Numbers Quiz Set 014

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Question 1

What is ${5.32^2 - 5.65^2}/{5.32 - 5.65}$?

 A

10.97.

 B

+0.33.

 C

-10.97.

 D

-.33.

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 = 5.32 + 5.65 = 10.97.


Question 2

What is y in $7.907 + 0.7 + y = 0.06$?

 A

-8.547.

 B

+8.547.

 C

-7.547.

 D

+7.547.

Soln.
Ans: a

y = 0.06 - (0.7 + 7.907) = -8.547.


Question 3

664945 is same as?

 A

$6.64945 × 10^{5}$.

 B

$6.64945 × 10^{4}$.

 C

$6.64945 × 10^{6}$.

 D

$6.64945 × 10^{3}$.

Soln.
Ans: a

Question 4

What is ${3.39^3 - 0.20^3}/{3.39^2 + 0.678 + 0.20^2}$?

 A

3.19.

 B

4.19.

 C

5.19.

 D

2.19.

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 = 3.39 - 0.20 = 3.19.


Question 5

What is ${42 × 1.9 - 68 × 5.2}/9.1$?

 A

$-30{8/91}$.

 B

$-30{7/91}$.

 C

$-30{6/91}$.

 D

$-30{9/91}$.

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: ${42 × 19 - 68 × 52}/91$ which equals ${-2738/91}$, which is same as: $-30{8/91}$


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Creative Commons License
This Blog Post/Article "Decimal Numbers Quiz Set 014" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2017-06-24.

Posted by Parveen(Hoven),
Aptitude Trainer


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