Question
How many exams are scheduled before Saturday?
Study the following information carefully and answer the questions below-: Six exams viz. Social , Physics, Chemistry, Computer, Arts and Hindi are to be scheduled starting from 2nd March and ending on 8th March with Sunday being an off day, not necessarily in the same order. Each of the exams has different time duration: 40 minutes, 50 minutes, 60 minutes, 75 minutes, 90 minutes and 100 minutes, again not necessarily in the same order. 8th march is not Sunday and an exam of 40 minutes is scheduled on that date. Social  exam is for less than 60 minutes and is scheduled immediately before Arts exam. There are two exams scheduled between Hindi exam which is for 100 minutes and Chemistry exam which is for 60 minutes. Arts exam is before Sunday and there are two days between Sunday and Social  exam. Computer exam which is for 75 minutes is not scheduled on 2nd march. The exam scheduled on Saturday is of 100 minutes.Solution
The exam schedule on Saturday is of 100 minutes. There are two exams scheduled between Hindi exam which is for 100 minutes and Chemistry exam which is for 60 minutes. Using the above mentioned hints, we have drawn a table shown below. Social exam is for less than 60 minutes and is scheduled immediately before Arts exam. Arts exam is before Sunday and there are two days between Sunday and Social exam. After using the above hints our table looks like this. 
Here, Case 2A fails because we cannot fit Computer exam in this case without contradicting the given hint. Here, we can fill the rest of the slots easily with Physics exam on Tuesday and duration of 90 min. for Arts exam. The final puzzle is as follows: 
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