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ANSWER
112
STEPS
a=2
S₅=1/4 of next 5 sums
S₅=1/4(S₁₀-S₅)
4S₅=S₁₀-S₅
4S₅+S₅=S₁₀
5S₅=S₁₀------------------------->1
THEN
Sn=n/2(2a+(n-1)d)
put a=2,n=5
=5/2(2(a)+(5-1)d)
we get
10+10d
then substitute for the next 5 terms with
a=2 & n=10
we get
20+45d
then substitute them in eqn 1
we get
5s₅=s₁₀
5(10+10d)=20 +45d
we get
5d=-30
d=-6
put it in An₂₀
An₂₀=2+(20-1)-6
=112
brainliest plz
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