a number 20 is divided into 4 parts that are in AP is 28 and sum of the first 8 terms of the same AP is 88.sum of first 16 terms of the AP is

Let the terms be a-3d,a-d,a+d,a+3d.

sum=28  a=7​        S8 = ​ ​4(2a+7d)        22=  14+7d       22-14=7d        8/7=d        S​ 1​6 = 8(14+15(8/7))              =1744/7 ​
 
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