diff --git a/chapter02/worksheets/solution2.5.2.7.scala b/chapter02/worksheets/solution2.5.2.7.scala
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+++ b/chapter02/worksheets/solution2.5.2.7.scala
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+/** 
+  Exercise 2.5.2.7
+  Reverse a sentence’s word order, but keep the words unchanged:
+
+  def revSentence(s: String): String = ???
+
+  scala> revSentence("A quick brown fox") // Words are separated by one space.
+
+  res0: String = "fox brown quick A"
+ */
+
+def revSentence(s: String): String = {
+  s.split(' ').reverse.mkString(" ")
+}
+
+val result =  revSentence("A quick brown fox")
+val expected: String = "fox brown quick A" 
+assert(result == expected)
+
+// scala> :load solution2.5.2.7.scala
+// :load solution2.5.2.7.scala
+// def revSentence(s: String): String
+// val result: String = fox brown quick A
+// val expected: String = fox brown quick A