Decimal - Quantitative Aptitude (MCQ) questions

1)   If 1.5 a = 0.03 b, then the value of (b – a)/ (b + a) is
- Published on 04 May 16

a. 490/51
b. 49/51
c. 4.9/51
d. None of these
Answer  Explanation 

ANSWER: 49/51

Explanation:
a/b = 0.03/1.5 = 3/150 = 1/50
(b – a)/(b + a)
= (1 – a/b)/((1 + a/b)
= (1 – 1/50)/ (1 + 1/50)
= 49/51


2)   0.003 * 0.5 = ?
- Published on 12 Apr 16

a. 0.00015
b. 0.0015
c. 0.015
d. 0.15
Answer  Explanation 

ANSWER: 0.0015

Explanation:
3 * 5 = 15. Sum of decimal places = 4.
0.003 * 0.5 = 0.0015 = 0.0015


3)   When 0.535353 ... is converted into a fraction, the result is
- Published on 25 Mar 16

a. 5/17
b. 20/9
c. 53/99
d. 53/100
Answer  Explanation 

ANSWER: 53/99

Explanation:
0.535353..... = 0.53
= 53/99


4)   3639 + 11.95 - x = 3054. Find the value of x.
- Published on 22 Mar 16

a. 407.09
b. 479.75
c. 523.93
d. 596.95
Answer  Explanation 

ANSWER: 596.95

Explanation:
Let 3639 + 11.95 – x = 3054
Then, x = (3639 + 11.95) – 3054

= 3650.95 – 3054
= 596.95


1