# Placement Questions & Answers :: Infosys

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## Total Qs: 288+

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31 / 288

How many 4 digit numbers contain number 2 ?

A3172

B3143

C3168

DNone of these

| | Important Formulas | Topic: | Asked In |

Explanation:

Total number of 4 digit numbers are 9000 (between 1000 and 9999).
We find the numbers without any two in them.
So total numbers are 8 * 9 * 9 * 9 = 5832
So, numbers with number two in them = 9000 - 5832 = 3168

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32 / 288

How many kgs of wheat costing Rs.24 per kg must be mixed with 30 kgs of wheat costing Rs.18.40 per kg so that 15% profit can be obtained by selling the mixture at Rs.23 per kg?

A10

B12

C15

D20

| | Important Formulas | Topic: | Asked In |

Explanation:

S.P. of 1 kg mixture = Rs.23. Gain = 15%.
CP of 1 kg mixture = Rs.[(100/115) * 23] = Rs.20
Lets assume the quantity of wheat costing Rs.24 = x kgs.
Using weighted average rule = (x*24+30*18.4)/ (x+30)=20
=> x = 12.

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33 / 288

Find the next term of the series:-
7,14,55,110,?

A121

B115

C125

D120

| | Topic: | Asked In |

Explanation:

7 + 7 = 14, and reverse of 14 is 41
Now, 41+14=55
Similarly,
Reverse of 55 is 55.
Thus, 55 +55=110.
Now, reverse of 110 is 011
so the next term is 110+011=121.

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A sells a bicycle to B at a profit of 20%. B sells it to C at a profit of 25%. If C pays Rs. 225 for it, the cost price of the bicycle for A is:

ARs. 110

BRs. 120

CRs. 125

DRs. 150

| | Important Formulas | Topic: | Asked In |

Explanation:

125% of 120% of A = 225.
=> 125/100 * 120/100 * A = 225
=> A = 225 * 2/3 = 150.

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35 / 288

In a cycle race there are 5 persons named as J,K,L,M,N participated for 5 positions. How many number of ways can M finishes always before N?

A55

B50

C60

D36

| | Important Formulas | Topic: | Asked In |

Explanation:

No. of ways in which 5 persons can finish is 5! = 120 (there are no ties)
Now, in half of these ways M can finish before N.

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There are 6561 balls out of them 1 is heavy. Find the min. no. of times the balls have to be weighed for finding out the heavy ball.

A12

B8

C18

D6

| | Important Formulas | Topic: | Asked In |

Explanation:

Here is no explanation for this answer

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37 / 288

When you reverse the digits of age of father you will get the age of son. one year ago the age of father was twice that of son's age. What are the current ages of father and son?

A73 & 37

B73 & 45

C65 & 37

DNone of these

| | Important Formulas | Topic: | Asked In |

Explanation:

Here is no explanation for this answer

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In a class there are less than 500 students . when it is divided by 3 it gives a whole number. similarly when it is divided by 4,5 or 7 gives a whole number. find the no. of students in the class

A242

B424

C342

D420

| | Important Formulas | Topic: | Asked In |

Explanation:

Here is no explanation for this answer

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A coffee seller has two types of coffee Brand A costing 5 bits per pound and Brand B costing 3 bits per pound. He mixes two brands to get a 40 pound mixture. he sold this at 6 bits per pound. the seller gets a profit of 33 1/2 percent. how much he has used Brand A in the mixture?

A33 pounds

B25 pounds

C30 pounds

D35 pounds

| | Important Formulas | Topic: | Asked In |

Explanation:

Let x and y quantities of A and B respectively are mixed.
=> x+y=40 --------- (1)
His total selling price = 40*6=240
His cost price 180 approx(as he makes 33.5 % profit)
5x+3y=180 ------------- (2)
On solving (1) and (2)
x=30 pounds.

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Joe's age , Joe's sister's age and Joe's fathers age sums up to a century. When sox s as old as his father, Joe's sister will be twice as old as now. When Joe is as old as his father then his father is twice as old as when his sister was as old as her father

AJoe=20 sister=35 father=50

BJoe=25 sister=30 father=50

CJoe=20 sister=30 father=50

DNone of these

| | Important Formulas | Topic: | Asked In |

Explanation:

Joe + joe's sister + father = 100 -------------(1)
After x years lets joe age is equal to his father
So. (joe + x) = father
Therefore, joe's sister + x = 2*sister
=>sister = x
joe+sister = father
therefore, 2*father=100
hence, Father=50, joe = 20 and sister = 30