Question

THE SUM OF 5th AND 24th TERM IS 50 WHAT IS THE SUM OF ITS 28th TERM

Answer 1

assume you are dealing with an AS 

a+4d + a+23d = 50 
2a + 27d = 50 

sum of first and 28th 
= a + a+27d 
= 2a + 27d 
= 50 

28th term = a + 27d 
= 50 - a