Aptitude - Decimal Fraction

Exercise :: Decimal Fraction - General Questions

11. 

0.04 x 0.0162 is equal to:

A. 6.48 x 10-3
B. 6.48 x 10-4
C. 6.48 x 10-5
D. 6.48 x 10-6

Answer: Option B

Explanation:

4 x 162 = 648. Sum of decimal places = 6.
So, 0.04 x 0.0162 = 0.000648 = 6.48 x 10-4

12. 

4.2 x 4.2 - 1.9 x 1.9 is equal to:
2.3 x 6.1

A. 0.5
B. 1.0
C. 20
D. 22

Answer: Option B

Explanation:

Given Expression = (a2 - b2) = (a2 - b2) = 1.
(a + b)(a - b) (a2 - b2)

13. 

If 144 = 14.4 , then the value of x is:
0.144 x

A. 0.0144
B. 1.44
C. 14.4
D. 144

Answer: Option A

Explanation:

144 = 14.4
0.144 x

144 x 1000 = 14.4
144 x

x = 14.4 = 0.0144
1000


14. 

The price of commodity X increases by 40 paise every year, while the price of commodity Y increases by 15 paise every year. If in 2001, the price of commodity X was Rs. 4.20 and that of Y was Rs. 6.30, in which year commodity X will cost 40 paise more than the commodity Y ?

A. 2010
B. 2011
C. 2012
D. 2013

Answer: Option B

Explanation:

Suppose commodity X will cost 40 paise more than Y after z years.

Then, (4.20 + 0.40z) - (6.30 + 0.15z) = 0.40

0.25z = 0.40 + 2.10

z = 2.50 = 250 = 10.
0.25 25

X will cost 40 paise more than Y 10 years after 2001 i.e., 2011.


15. 

Which of the following are in descending order of their value ?

A.
1 , 2 , 3 , 4 , 5 , 6
3 5 7 5 6 7
B.
1 , 2 , 3 , 4 , 5 , 6
3 5 5 7 6 7
C.
1 , 2 , 3 , 4 , 5 , 6
3 5 5 6 7 7
D.
6 , 5 , 4 , 3 , 2 , 1
7 6 5 7 5 3

Answer: Option D

Explanation:

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