Placement Papers - Infosys

Infosys
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They given 12 puzzles for 50 marks
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Question # 1
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Five people A ,B ,C ,D ,E are related to each other.
Four of them make one true statement each as follows.
(i) B is my father\'s brother.    
(ii) E is my mother-in-law.
(iii)C is my son-in-law\'s brother
(iv)A is my brother\'s wife.

who made these statemens and what are the relationships among them?
( 8 marks)

Ans:  
(i)  D
(ii) B
(iii) E
(iv) C
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Question # 2
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fathers wife is reverse of son\'s age . one year back faters age was twice of son\'s age. what\'s the fathers current age

ans : 73
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Question # 3
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An escalator is descending at constant speed. A walks down and takes 50 steps to reach the bottom. B runs down and takes 75 steps in the same time as A takes 3 steps. How many steps are visible when the escalator is not operating?

Ans: ????
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Question # 4
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a man asks a weatherman what\'s the past five days temp? he says i didn\'t remember but i can say their product is 12 and all are diff temperatures. what are the five temperatures?

ans: -2,-1,1,2,3
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Question # 5
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there are 100 men among them 80 have telephones and 70 have cars and some 75 have houses and 85 have mobiles.(data is not exact) . what is the minimum
number of men that have all these things.?
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Question # 6
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there ia truck which should reach some place at 11\'o clock , if it travels with 30 mph it reaches i hour before, if it travles with 20 mph it reaches 1 hour late. what is the distance it must be travlled and what is the speed it must maintain to rech at exact time?

ans: 120 miles and 24 mph
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Question # 7
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there are some stones (may be 6231) with eqaul weight, but one of them having more weight than others,how many times we need to weigh to find that
overweigheted stone?
ans: 12 ( as per the number given there, that no of stones i didn\'t remember exactly).
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Question # 8
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two and half artists with two and half canvases and two in two and half hours cvan paint two and half drawings. how many artists are needed for 24 canvases
and 24 drawings in 20 hours?

ans :