Aptitude - Decimal Fraction
Overview Exercise "Everything should be made as simple as possible, but not simpler."
- Albert Einstein
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: C
Explanation:
4 x 162 = 648. Sum of decimal places = 6.-4
12.
4.2 x 4.2 - 1.9 x 1.9
is equal to:
2.3 x 6.1
Answer: A
Explanation:
Given Expression =
(a 2 - b 2 )
=
(a 2 - b 2 )
= 1.
(a + b )(a - b )
(a 2 - b 2 )
13.
If
144
=
14.4
, then the value of x is:
0.144
x
Answer: E
Explanation:
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 ?
Answer: E
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
z = 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: B
Explanation:
No answer description available for this question. Let us discuss
X will cost 40 paise more than Y 10 years after 2001 i.e., 2011.