A milkman mixes 20 litres of water with 80 litres of milk. After selling one-fourth of this mixture, he adds water to replenish the quantity that he has sold. What is the current proportion of water to milk

1.  2 : 3

2.  1:2

3.  1:3

4.  3:4

View Answer  
4
Correct Answer :

2 : 3


Explanation :
No Explanation available for this question

If the sum of the first 11 terms of an arithmetic progression equals that of the first 19 terms, then what is the sum of the first 30 terms

1.  0

2.  –1

3.  1

4.  Not unique

View Answer  
4
Correct Answer :

0


Explanation :
No Explanation available for this question

If a man cycles at 10 km/hr, then he arrives at a certain place at 1 p.m. If he cycles at 15 km/hr, he will arrive at the same place at 11 a.m. At what speed must he cycle to get there at noon

1.  11 km/hr

2.  12 km/hr

3.  13 km/hr

4.  14 km/hr

View Answer  
4
Correct Answer :

12 km/hr


Explanation :
No Explanation available for this question

On January 1, 2004 two new societies, S1, and S2, are formed, each with n members. On the first day of each subsequent month, S1 adds b members while S2 multiplies its current number of members by a constant factor r. Both the societies have the same number of members on July 2, 2004. If b = 10.5n, what is the value of r

1.  2.0

2.  1.9

3.  1.8

4.  1.7

View Answer  
4
Correct Answer :

2.0


Explanation :
No Explanation available for this question

The total number of integer pairs (x, y) satisfying the equation x + y = xy is

1.  0

2.  1

3.  2

4.  None of the above

View Answer  
4
Correct Answer :

2


Explanation :
No Explanation available for this question

Suppose n is an integer such that the sum of the digits of n is 2, and 1010< n < 1011. The number of different values for n is

1.  11

2.  10

3.  9

4.  8

View Answer  
4
Correct Answer :

11


Explanation :
No Explanation available for this question

If a/b+c=b/c+a=c/a+b=r, then r cannot take any value except

1.  1/2

2.   –1

3.  1/2 or –1

4.  –1/2 or –1

View Answer  
4
Correct Answer :

1/2 or –1


Explanation :
No Explanation available for this question

Let y What is the value of y

1.  √13+3/2

2.  √13-3/2

3.  √15+3/2

4.  √15-3/2

View Answer  
4
Correct Answer :

√15-3/2


Explanation :
No Explanation available for this question

Two boats, traveling at 5 and 10 kms per hour, head directly towards each other. They begin at a distance of 20 kms from each other. How far apart are they (in kms) one minute before they collide

1.  112

2.  16

3.  14

4.  13

View Answer  
4
Correct Answer :

14


Explanation :
No Explanation available for this question

In Nuts And Bolts factory, one machine produces only nuts at the rate of 100 nuts per minute and needs to be cleaned for 5 minutes after production of every 1000 nuts. Another machine produces only bolts at the rate of 75 bolts per minute and needs to be cleaned for 10 minutes after production of every 1500 bolts. If both the machines start production at the same time, what is the minimum duration required for producing 9000 pairs of nuts and bolts

1.  130 minutes

2.  135 minutes

3.  170 minutes

4.  180 minutes

View Answer  
4
Correct Answer :

170 minutes


Explanation :
No Explanation available for this question
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