Question

ABC三个数的平均是70,A比B等于二比三,B比C等于四比五,A是B是C是

Answer 1

A:B=2:3=8:12 B:C=4:5=12:15 A:B:C=8:12:15 A+B+C=70*3=210 A=210*8/35=48 B=210*12/35=72 C=210*15/35=90

麻烦采纳,谢谢!