Question

a+b+c=? . .a:b=4rest2. ...c:b=5rest2 .....c-a=285

Answer 1

a:b = 4 rest 2
a = 4×b+2
c:b = 5 rest 2
c = 5×b+2
c -a = 285

a |___|___|___|___|+2
b |___|
c |___|___|___|___|___|+2
5 segmente egale +2 - 4 segmente egale +2 = 1 segment egal +4 = 285
285 - 4 = 281(un segment egal)
a = 4×281+2 = 1 124+2 = 1 126
b = 281
c = 5×281+2 = 1 405 +2 = 1 407

1 126 + 281+1 407 = 2 814