# 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

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 C. 20 D. 22

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

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

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 = 2.5 = 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