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Someone please explain the concept of the problems from the daily classroom session (Data over years) set 2 and set 3 . I am unable to understand 

If Boys pass % - 62
girls pass% - 76
overall pass percentage of class % - 68

Find what percentage of Students in class were Girls?

How to solve in error correction on banking exam? 

this app is good in beginning for free mocks but now it is not provided any free mocks so plz provide free mocks for upcoming exams.

Name of capital of Canada.

Some pen are not pink.
All pinks are blacks.
some blacks are not brown.
Some browns are reds.
All reds are yellows.
No yellow is orange.
Con:
I.All pink being pen is a possibility.
II.Some reds are not blacks.

which of these follows the statement

some reds are trees.
all tree are black.
no tree is carbon
All carbon are air
some carbon are oxygen.
no oxygen is ozone.
Con:
All red being ozone is a possibility.

does this conclusion follow statements

123!  can be written in the form of 4n. how???

number of non-negative integral solutions of

a+b+c+d<=15 ?