The difference between the 11th term and the 4th term of an A.P is 49. If the 11th term is 2 24/25times the fourth number
a+10d - (a+3) = 49
7d = 49
d = 7
a+10d = 74/25(a+3d)
a + 70 = 74/25(a + 21)
solve for a, then find out whatever missing question you had