The set of positive integers greater than 2 and less than 6

Answer 1

{3,4,5}
surely you know what integers are ...

Answer 2

WORD PROBLEMS LEADING TO SIMULTANEOUS EQUATION.THE PE RIMETER OF THE ISOSCELES TRIANGLE IS 28CM.FIND X AND Y AND HENCE STAT THE LENGTHS OF TH SIDES OF TH TRIANGLE.

Answer 3

all we know is that 2x+y = 28
Unless you have further information, you cannot determine unique values for the sides.