ABC三个数的平均数是70,A:B=2:3,B:C=4:5, 则:A=_,B=_,C=_.

问题描述:

ABC三个数的平均数是70,A:B=2:3,B:C=4:5,
则:A=______,B=______,C=______.

A:B=2:3=8:12,
B:C=4:5=12:15,
A:B:C=8:12:15;
70×3=210,
8+12+15=35,
A=210×

8
35
=48,
B=210×
12
35
=72,
C=210×
15
35
=90.
故答案为:48,72,90.