Question

三名同学捐钱310元,甲同学捐的钱是乙同学的二十一分之五,丙同学捐的是甲同学的五分之四,三名同学捐了多少

Answer 1

设甲同学捐款x元,则乙同学捐款21/5 x元,丙同学捐款4/5 元

x+21/5 x+ 4/5 x=310

6x=310

x=52

21/5 x=218.4

4/5 x=41.6

答：甲、乙、丙三名同学分别捐款52元,218.4元,41.6元.