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In a class, there are 80 students who study both Computer Science and Electronics. While 100 students study Computer Science, 120 Students study Electronics, How many of them study Computer Science only? 

212 : 436 : 560 : ?

In a row of girls, Kamya is 5th from the left and Preeti is sixth from right. When they exchange their position, then Kamya becomes 13th from the left. What is the new position of Preeti from right?

Which of the following calendar years is similar to the calendar of the year 2003?

In the class of boys and girls, the rank of Obama is15th and the rank of Shabana is 8th.The rank of Obama is 8th only in boys and Shabana’s rank is 4th only in girls. In the boys and girls, Obama’s rank is 18th from other side. Shabana’s rank is 7th only in girls from other end. Then find the total number of boys in the class. 

Each of A, B, C, D, E, F and G has an exam on a different day of a week starting from Monday and ending on Sunday of the same week. A has an exam on Wednesday. Only one person has an exam between A and B. D has an exam on the day immediately before B. Only one person has an exam between F and B. G’s exam is on one of the days before A but on one of the days after C. On which day does G have an exam?

The weights of 4 boxes are 70, 100, 20 and 40 kilograms. Which of the following cannot be the total weight, in kilograms, of any combination of these boxes and in a combination a box can be used only once.