The forth term of an A.P is four times the first term. The sixth term is sixty, find the sum of 30 terms, common difference, and the first term.

1 answer

Use what you know about Aps. They have told you that
a+3d = 4a
a+5d = 60
Solve for a and d, and then
S30 = 30/2 (2a+29d)