??????� �??????�????????????�=??????
8??????−60=60−7X
8??????+7X = 60 + 60
15X = 120
X = 120 / 15
X=8
Al comienzo = X
X + 3 = 3( X –3) + 1(X-3)
X + 3 = 4(X –3)
X +3 = 4X – 12
3 + 12 = 4X – X
15 = 3X
X = 15 / 3
X=5
Si hubiera perdido 3 == (X – 3)
Personas en la reunión = X
X – 14 = X -
2
9
X
X – X +
2
9
X = 14
2
9
X = 14
2X = 14 . 9
X =
126
2
X=63
X – 14 = 63 – 14 => quedaron 49 personas