Question

fifth term of an ap is 20 and sum of its seventh and eleventh terms is 64 find common difference

Answer 1

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5th term is 20. 
a+4d = 20.---- (1) 
7th term + 11th term is 64 
a+6d +a + 10d = 64. 
2a + 16d = 64. 
a+8d = 32.-----(2) 
solving equations 1 and 2. 
4d = 12. 
d= 3..

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Answer 2

hope this answer will help you.