In Math test out of 10 marks for students got 4 marks and 6 got 5 marks what will be the average marks of class:

={( number of student X marks)+( number of student X marks)}/ total students

={( 4 x 10)+(6Ã—5)}/6+4

=(40+30)/10

= 7 is the average marks of class.

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Look at this series: 22, 21, 23, 22, 24, 23, . . .

What number should come next?

What number should come next?

In this simple alternating subtraction and addition series;

1 is subtracted, then 2 is added, and so on.

Rule = (first number - 1), (second number + 2), (third number - 1), (fourth number + 2)....

Now The series is 22, 21, 23, 22, 24, 23, . .

(22 - 1 = 21), (21 + 2 = 23), (23 - 1 = 22), (22 + 2 = 24), (24 - 1 = 23), (23 + 2 = 25)...

So the answer is 25..