花布长42米,比白布多3\4,白布长多少米?请大家讲讲

花布长42米,比白布多3\4,白布长多少米?请大家讲讲
花布长42米,比白布多3\4,白布长多少米?
请大家讲讲

花布长42米,比白布多3\4,白布长多少米?请大家讲讲
42×3/4=31.5

设白布为x 则花布是7/4x 所以24米

设白布是X
X+3/4X=42
7/4X=42
X=42x4/7
X=24
答：X=24米