Respuesta :

d=6

b=4

c=6

hope this helps


a+b+c+d=20

Since a = 4, b = 4

So, 4+4+c+d=20

8+c+d=20

c+d=20-8

c+d=12

c=d

c=d=12/2=6

Therefore, b=4, c=6, d=6

Hope it helps :)