Question

a+r+g=57. a+r=37. r+g=33.

Answer 1

a+r+g=57
a+r=37
a=37-r
r+g=33
g=33-r
37-r+r+33-r=57
-r+r-r=57-37-33
-r=20-33
-r=-13 |×(-1)
r=13
a=37-r
a=37-13
a=24
g=33-r
g=33-13
g=20

Answer 2

In a+r+g=57 inlocuiesti a+r cu 27 deci
37 + g = 57
g = 57 - 37
g = 20

Inlocuiesti g in r + g = 33 deci
r + 20 = 33
r = 33 - 20
r = 13

Inlocuiesti r si g in a + r + g = 57 deci
a + 13 + 20 = 57
a + 33 = 57
a = 57 - 33
a = 23

a + r + g este 57?
24 + 13 + 20 = 57