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How to solve this one... can someone pls give detailed steps?The integers 1, 2, …, 40 are written on a blackboard. The following operation is then repeated 39 times: In each repetition, any two numbers, say a and b, currently on the blackboard are erased and a new number a + b – 1 is written. What will be the number left on the board at the end?

How to solve tournament related questions?
Specifically a question in the mock cat 1, Question set 59-62?

When all students in a school are made to stand in a row of 54, 30 such rows are formed. If the students are made to stand in the rows of 45, how many such rows can be formed ?

When all students in a school are made to stand in a row of 54, 30 such rows are formed. If the students are made to stand in the rows of 45, how many such rows can be formed ?

When all students in a school are made to stand in a row of 54, 30 such rows are formed. If the students are made to stand in the rows of 45, how many such rows can be formed ?

4, 3,4.5,8.75 ,20

the difference in the angles of a rhombus is 60.what is the ratio of the length of the diagonals of the rhombus?

A B C and D are points on a circle such that ABC is a equilateral triangle and AD is the diameter of the circle,if the radius of the circle is 2cm what is the area of quadilateral ABDC? how sides of equilateral triangle if found?

The number 649578 is divisible by a)5 b)9 c)6 d)11

What is the best way to approach DI questions? As they tend to be calculation extensive, what is the best strategy to optimise the time?