7 x ( a + b) = ( a + b ) + 360
7 x a + 7 x b - a - b = 360
6 x a + 6 x b = 360
6 x ( a + b ) = 360
a + b = 360 : 6
a + b = 60
a/4 = b/2 ⇒ 2 a = 4 b ⇒ a = 4 b /2 = 2b
Inlocuiesc in suma celor doua numere:
a + b = 60
2 b + b = 60
3 b = 60
b = 60 : 3
b = 20
a = 2 x 20 = 40
Verific: 7 x ( 40 + 20 ) = ( 40 + 20) + 360
7 x 60 = 60 + 360
420 = 420 (A)
Raspuns: 40, 20