Big book Test 8 Section 6 Q 30

[user8352]

What should be the process to solve this question?

The answer is E

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How to Ask Better GRE Questions on Forums

Welcome to the forums! Since GregMat (who is a very chill person) doesn’t have any specific formatting rules when it comes to asking questions on the forums, I feel like there should at least be a reference text of some sort that can help people ask better questions and make the process more enjoyable for those who try to answer them. The Golden Rule: Imagine You’re Trying To Answer the Question Before you post your question about GRE preparation, practice questions, or strategies, try to put y…

[user1387]

Least possible value for 11k =13p should be lcm of 11 and 13
Look for lcm of 13 ad 12 which is 143.
11(s-1)=143
s=14
13(r-1)=143
r=12
r+s=26

[user8352]

Thanks a lot! Makes sense now!