Aptitude - Decimal Fraction

Exercise :: Decimal Fraction - General Questions

6. 

When 0.232323..... is converted into a fraction, then the result is:

A.
1
5
B.
2
9
C.
23
99
D.
23
100

Answer: Option C

Explanation:

0.232323... = 0.23 = 23
99

7. 

.009 = .01
?

A. .0009
B. .09
C. .9
D. 9

Answer: Option C

Explanation:

Let .009 = .01;     Then x = .009 = .9 = .9
x .01 1

8. 

The expression (11.98 x 11.98 + 11.98 x x + 0.02 x 0.02) will be a perfect square for x equal to:

A. 0.02
B. 0.2
C. 0.04
D. 0.4

Answer: Option C

Explanation:

Given expression = (11.98)2 + (0.02)2 + 11.98 x x.

For the given expression to be a perfect square, we must have

11.98 x x = 2 x 11.98 x 0.02 or x   = 0.04


9. 

(0.1667)(0.8333)(0.3333) is approximately equal to:
(0.2222)(0.6667)(0.1250)

A. 2
B. 2.40
C. 2.43
D. 2.50

Answer: Option D

Explanation:

Given expression
= (0.3333) x (0.1667)(0.8333)
(0.2222) (0.6667)(0.1250)
= 3333 x
1 x 5
6 6
2222
2 x 125
3 1000
= 3 x 1 x 5 x 3 x 8
2 6 6 2
= 5
2
= 2.50

10. 

3889 + 12.952 - ? = 3854.002

A. 47.095
B. 47.752
C. 47.932
D. 47.95

Answer: Option D

Explanation:

Let 3889 + 12.952 - x = 3854.002.

Then x = (3889 + 12.952) - 3854.002

   = 3901.952 - 3854.002

   = 47.95.