In an A.P., the first term is 2 and the sum of the first five terms is one-fourth of the next five terms. Find the 20th term.
-112
-57
-55
0
55
112
-112
-57
-55
0
55
112
Charged up again to beat the beast 
1st 5 terms: 2, 2+d, 2+2d,......,2+4d
=>sum of 1st 5 terms=10+10d
sum of next 5 terms: (2+5d)+(2+6d)+...+(2+9d)=10+35d
given that 10+10d=(10+35d)/4
=>d=-6
20th term: 2+19d=2+19*-6=-112
hence, A
