Răspuns :
a + a : 4 + a : 2 = 35 | × 4
4a + a + 2a = 140
7a = 140
a = 140 : 7
a = 20
2a = 20 × 2
2a = 40 => d)
4a + a + 2a = 140
7a = 140
a = 140 : 7
a = 20
2a = 20 × 2
2a = 40 => d)