Decimal Fraction

Decimal Fraction

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Question 1
What decimal of an hour is a second ?
A
.0025
B
.0256
C
.00027
D
.000126
Question 1 Explanation: 
Required decimal =1/(60 x 60)= .00027
Question 2
if 2994 ÷ 14.5 = 172, then 29.94 ÷ 1.45 = ?
A
0.172
B
1.72
C
17.2
D
172
Question 2 Explanation: 
29.94/1.45<==>299.4/14.5 ==>(2994/14.5)x(1/10) =172/10(via Q) = 17.2
Question 3
.009/? = .01
A
.0009
B
.09
C
.9
D
9
Question 3 Explanation: 
Let .009/x= .01; Then x =.009/.01=.9
Question 4
3889 + 12.952 - ? = 3854.002
A
47.095
B
47.752
C
47.932
D
47.95
Question 4 Explanation: 
Let 3889 + 12.952 - x = 3854.002. Then x = (3889 + 12.952) - 3854.002 = 3901.952 - 3854.002 = 47.95.
Question 5
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
Question 5 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/.25=250/25= 10. X will cost 40 paise more than Y 10 years after 2001 i.e., 2011.
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