38-3×5
=38-15
=23(分)
设“布”赢“锤子”x次,则“锤子”赢“剪刀”(5-x)次,由题意得:
5x+(5-x)×4=23
5x+20-4x=23
x=3
答:小华“布”赢“锤子”3次.
故答案为:3.