Question

[(2a+178)•15+90]:45=630. Cine ma ajuta?

Answer 1

(2a+178)•15+90=630•45
(2a+178)•15=28350-90
(2a+178)•15=28260
2a+178=28260:15
2a+178=1884
2a=1884-178
2a=1706
a=1706:2
a=853

Answer 2

((2a+178) x 15 + 90) : 45= 630
(2a+178)x15 +90= 630 x45
(2a+178) x15 +90= 28350
(2a+178) x15 = 28350 -90
(2a+178)x15= 28260
2a+178= 28260:15
2a+178=1884
2a=1884-178
2a=1706
a=1706:2
a=853