Question

Alfati x pentru care: 0,x+1,x+2,x+3,x+...+9,x = 48
Va roooog dau coroana

Answer 1

x/10+(10+x)/10+(20+x)/10+....+(90+x)/10 =48
(10*x+10+20+...+90)/10=48
10*x+100*90/2=480
10*x+450=480
10*x=30
x=3