Resposta :
Tainara = x
Mara = 2x-10
Eliana = 2x-10+40
x+2x-10+2x-10+40
5x=-20+40
5x=20/5
x=4
Tainara = 4
Mara = -2
Eliana = 28
Mara = 2x-10
Eliana = 2x-10+40
x+2x-10+2x-10+40
5x=-20+40
5x=20/5
x=4
Tainara = 4
Mara = -2
Eliana = 28