Question

A+b+c=100
A:b=4
B-c=2
A,b,c=?
Metoda figurativă

Answer 1

a+b+c = 100
a:b =4 => a= 4×b
b-c = 2 = > b = c+2

a |___|___|___|___|+8
b |___|+2
c |___|

avem 6 segmente egale +8+2 = 100
100-10 = 90
90:6 = 15 ( un segment)
a = 4×15+8 = 60+8 = 68
b = 15+2 = 17
c = 15

Verificare:
68+17+15 = 100
68:17 = 4

a = 68
b = 17
c = 15