Respuesta :

LukeG1

Answer:

Donna = 19

Mary = 30

Step-by-step explanation:

M = Mary

D = Donna

M + D = 49 games

M = D + 11

Substitute Mary's new value into original equation

D + 11 + D = 49 games

2D + 11 = 49

2D = 38

D = 19

M = 49 - 19 = 30

Hope this helps :)