Question

Aflati termenul necunoscut ,, A ''

(245 : 5 + 5 x A ) : 9 + 89 =100

Answer 1

(49+5A) : 9 = 100-89
49+5A = 11x9
5A = 99-49
5A = 50
A= 10

Answer 2

(49+5xA):9+89=100
(49+5xA):9=100-89
(49+5xA):9=11
49+5xA=9x11
49+5xA=99
5xA=99-49
5xA=50
A=50:5
A=10