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Five persons- A, B, C, D and E - are either guards of thieves. The guards always tell the truth whereas thieves always lie. A claims that B is a guard. B claims that C is a thief. C claims that D is a thief. E claims that A is a guard. D claims that B and Eare different kinds. The number of thieves is

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Important Questions on Decision Making

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Mr. Basu looks at the calendar for 20 ab. He finds that April 20 ab has exactly four Mondays afid fouf Frldays. 1st April 20 ab would fall on
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'Life expectancy' is the average age at death of the entire live-born population. In the middle of the nineteenth century, life expectancy in North America was 40 years, whereas now it is nearly 80 years. Thus, in those days, people must have been considered old at an age that we now consider the prime of life. Which of the following, if true, undermines the argument above?
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Persons X, Y, Z, and Q live in red, green, yellow, or blue-colored houses placed in a sequence on a street. Z lives in a yellow house. The greenhouse is adjacent to the blue house. X does not live adjacent to Z. The yellow house is in between the green and red houses. The color of the house, X lives in is:
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. Eighty kilograms (kg) of store material is to be transported to a location, 10 km away. Any number of couriers can be used to transport the material. The material can be packed in any number units of 10,20 or 40 kg. Courier charges are, 10 per hour. Couriers travel at the speed of 10 km/hr if they are not carrying any load, at 5 km/hr if carrying 10 kg, at 2 km/hr if carrying 20 kg and at 1 km/hr if carrying 40 kg. A courier cannot carry more than 40 kg of load. The minimum cost at which 80 kg of store material can be transported to its destination will be
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A leading business magazine has come out with a survey that among the people who used computers at their place of employment last year, those who also owned portable ('Laptop') computers earned 40 % more on average than those who did not. It is obvious from this that owning a Laptop computer led to a higher paying job. Which one of the following identifies a reasoning error in the argument?
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Automobile accident insurance premium is often higher for red cars than for cars of any other color. To justify these higher charges, insurance companies claim that, overall, a higher percentage of red cars cause accidents than cars of any other color. If this claim is true then damage to lives could undoubtedly be saved by banning red cars from the roads altogether.

The reasoning in the argument is flawed because of the argument.

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Smoking bidis (traditional Cigarettes) in bed has long been the main cause of home fires. Despite a significant decline in bidi smoking in the last two decades, however, there has been no comparable decline in the number of people killed in home fires.

Each one of the following statements if true over the last two decades helps to resolve the apparent discrepancy above except.

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Our new bank automation system, the purpose of which is to increase productivity and efficiency can be installed during the day, which would disrupt our employees work, or else at night, which would entail much higher installation charges since saving money is important, we will have the system installed during the day.

The system administrator's argument assumes one of the following.