CAT QUANT NUMBER SYSTEM 4

Of 128 boxes of oranges each box contains at least 120 and at most 144 oranges. The number of boxes containing the same number of oranges is at least:

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 black board are erased and a new number (a+b-1) is written. What will be the number left on the board at the end?

How many natural numbers up to 200 are divisible by 2 and 3 both?

The sum of two numbers is 100 and their difference is 37. The difference of their square is:

How many times a type writer must press the keys of the keypad to type all the natural numbers from 1 to 1000?

A change making machine contains one-rupee, two-rupee and five-rupee coins. The total number of coins is 300. The amount is RS 960. If the number of one-rupee coins and two-rupee coins are interchanged, the value comes down by Rs 40. The total number of 5 rupee coins is:

In an examination a student answered 15 questions correctly and secured 40 marks. If there were two types of questions ( 2 marks and 4 marks questions) , how many questions of 2 marks did he answer correctly?

All the page numbers of a book are added beginning with page 1. However one page number was added twice by mistake. The sum obtained was 1000. Which page number was added twice?

1, 11,21,1211, ?What will come in place of question mark?

What is the average of 1st 20 multiples of 9?