A. 7
B. 8
C. 9
D. 10
Explanation:
96% —- 12
144% —- ?
96/144 * 12 = 8
A. 7 hours
B. 8 hours
C. 14 hours
D. 28 hours
Explanation:
2/7 – 1/x = 1/4
x = 28
A. 49
B. 94
C. 83
D. Either (a) or (b)
E. None of these
Explanation:
Let the number be in the form of 10a + b
Number formed by interchanging a and b = 10b + a.
a + b = 13 — (1)
10b + a = 10a + b – 45
45 = 9a – 9b => a – b = 5 — (2)
Adding (1) and (2), we get
2a = 18 => a = 9 and b = 4
The number is: 94.
A. 3.5
B. 4.5
C. 5.6
D. 6.5
Explanation:
C.P. of 1 toy = 375/12 = Rs. 31.25
S.P of 1 toy = Rs. 33
Profit = 1.75/31.25 * 100 = 28/5 = 5.6%
A. 5/21
B. 5/14
C. 9/14
D. 16/21
Explanation:
Number of ways of (selecting at least two couples among five people selected) = (⁵C₂ * ⁶C₁)
As remaining person can be any one among three couples left.
Required probability = (⁵C₂ * ⁶C₁)/¹⁰C₅
= (10 * 6)/252 = 5/21
A. Rs. 270
B. Rs. 290
C. Rs. 300
D. None of these
Explanation:
Marked price be Rs. X
Discount availed by the retailer = 15% of Rs. X
C.P of the machine by the retailer
= (X – 15% of X) = Rs. 17X/20
15% of 17X/20 = 1955 – 17X/20
51X/400 + 17X/20 = 1955 or
X = 2000 Discount received retailer
= (15% of Rs. 2000) = Rs. 300
A. Rs. 45
B. Rs. 50
C. Rs. 55
D. Rs. 60