Decimal Fraction

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: D

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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: B

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.

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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: A

144	=	14.4
0.144	=	x

	144 x 1000	=	14.4
	144		x

x =	14.4	= 0.0144
	1000

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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: B

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

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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: B

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

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Questions for: Decimal Fraction