And then...
Then the boy ... making him y
2y + 2x =20
2y + 2(5)=20
2y+ 10 =20
2y=10
y=5
And then...
Then the boy ... making him y
2y + 2x =20
2y + 2(5)=20
2y+ 10 =20
2y=10
y=5
And then the berries/ice cream... z
2z +2z +y =13
4z + y =13
4z + 5 =13
4z=8
z=2
So then... if we presume the boy holding the berries is addition...
z(x + y + z + z)=?
2(5+5+2+2)=?
2(14)=?
28=28