423%2BS=600
Solve that to complete the problem.
Let +x+ = her 5th score
[ average of scores ] = [ total of scores] / [ number of games ]
+120+=+%28+115+%2B+84+%2B+123+%2B+101+%2B+x+%29+%2F+5+
+600+=+115+%2B+84+%2B+123+%2B+101+%2B+x+
+600+=+423+%2B+x+
+x+=+600+-+423+
+x+=+177+
The lowest score Laura will
need in the fifth game is 177
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