diff --git a/Chapter 7/README.md b/Chapter 7/README.md
index 63b95cb..1b67678 100644
--- a/Chapter 7/README.md	
+++ b/Chapter 7/README.md	
@@ -194,4 +194,4 @@ If we doubles each job length, average response time also get double too. It mea
 ### What happens to response time with RR as quantum lengths increase? Can you write an equation that gives the worst-case response time, given N jobs?
 
 Response time increases linearly with quantum length increase.
-Let N be the number of jobs and q the quantum length, then the worst-case response time is (N-1)q/N.
+Let N be the number of jobs and q the quantum length, then the worst-case response time is (N-1)q/2.