4
Q:

A bag contains 12 white and 18 black balls. Two balls are drawn in succession without replacement. What is the probability that first is white and second is black?

A) 6/145 B) 36/145
C) 18/95 D) 12/145

Answer:   B) 36/145



Explanation:
 

The probability that first ball is white:
=C112C130=1230=25


Since, the ball is not replaced; hence the number of balls left in bag is 29.
Hence the probability the second ball is black:
=C118C129=1829


Required probability =(25)×(1829)


=36/145

Q:

The Simple interest accrued on an amount of Rs. 2,500 at the end of six years is Rs.1875. What would be the simple interest accrued on an amount of Rs. 6875 at the same rate and Same period? 

A) Rs. 4,556.5 B) Rs. 5,025.25
C) Rs.5,245.5 D) None of these
 
Answer & Explanation Answer: D) None of these

Explanation:
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16 1343
Q:

Excluding the stoppages, the speed of a bus is 64 km/hr and including the stoppages the speed o the bus is 48km/hr. For how many minutes does the bus stop per hour?

A) 12.5 minutes B) 15 minutes
C) 10 minutes D) 18 minutes
 
Answer & Explanation Answer: B) 15 minutes

Explanation:
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29 2414
Q:

If 25a + 25b = 115, then what is the average of a and b?

A) 4.6 B) 3.4
C) 2.5 D) None of these
 
Answer & Explanation Answer: D) None of these

Explanation:
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34 2363
Q:

There are two numbers such that the sum of twice the first number and thrice the second number is 300 and the sum of thrice the first number and twice the second number is 265. Which is the largest number ?

A) 24 B) 39
C) 85 D) 74
 
Answer & Explanation Answer: D) 74

Explanation:
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8 1452
Q:

Prithvi spent Rs.89,745 on his college fees, Rs 51,291 on Personality Development Classes, and the remaining 27% of the total amount he had as cash with him. What was the total amount?

A) Rs.1,85,400 B) Rs.1,89,600
C) Rs.1,91,800 D) Rs.1,93,200
 
Answer & Explanation Answer: D) Rs.1,93,200

Explanation:
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10 1641