设足球x个,篮球y个,排球z个。根据题意得x+y+z=20(1) 50*x+40*y+30*z=960.(2)这两个式子,然后将x从1开始带,直到3个烂码均为整扰巧数饥李哪就是答案
x+y+z=2050x+40y+30z=96020x+10y=3602x+y=36x=2选b