Decimal Numbers Quiz Set 018

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Question 1

What is y in $4.121 + 0.4 + y = 0.09$?

 A

-4.431.

 B

+4.431.

 C

+4.134.

 D

-4.134.

Soln.
Ans: a

y = 0.09 - (0.4 + 4.121) = -4.431.


Question 2

What is ${94 × 9.8 - 73 × 8.9}/8.2$?

 A

$33{9/82}$.

 B

$33{7/82}$.

 C

$33{5/82}$.

 D

$33{11/82}$.

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: ${94 × 98 - 73 × 89}/82$ which equals ${2715/82}$, which is same as: $33{9/82}$


Question 3

What is x in ${149/0.0149} = {1.49/x}$?

 A

$1.49 × 10^{-4}$.

 B

$1.49 × 10^{-5}$.

 C

$1.49 × 10^{-3}$.

 D

$1.49 × 10^{-2}$.

Soln.
Ans: a
Transposing, x = $1.49 × {0.0149/149}$ which gives 0.000149, which, in scientific form is $1.49 × 10^{-4}$.

Question 4

What is ${7.91^3 - 0.50^3}/{7.91^2 + 3.955 + 0.50^2}$?

 A

+7.41.

 B

-7.41.

 C

+8.41.

 D

-8.41.

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 = 7.91 - 0.50 = 7.41.


Question 5

What is ${0.70 × 0.70 × 0.70 + 0.03 × 0.03 × 0.03}/{3.50 × 3.50 × 3.50 + 0.15 × 0.15 × 0.15}$?

 A

$1/5^3$.

 B

$1/7^3$.

 C

$1/5^2$.

 D

$1/7^2$.

Soln.
Ans: a

By inspection, the given ratio is same as ${0.70 × 0.70 × 0.70 + 0.03 × 0.03 × 0.03}/{5^3 × ({0.70 × 0.70 × 0.70 + 0.03 × 0.03 × 0.03})}$ which is $1/5^3$.


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Creative Commons License
This Blog Post/Article "Decimal Numbers Quiz Set 018" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2017-10-26.

Posted by Parveen(Hoven),
Aptitude Trainer


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