"sum of 8th term" makes no sense. A sum has to add two things.
Now, if you meant to say "sum of the first 8 terms" then you have
8/2 (2a+7d) = 160
20/2 (2a+19d) = 880
Then solve for a and d, then find
a + 42d
and
12/2 (2a+11d)
We're doing math here. If you can't say what you mean, then you have no hope of getting an answer that means anything.
The sum of 8th term of an AP is 160 while the sum of 20th is 880 fine the 43 term and the sum of the 12 term
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