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5
120 300
2
botellas de 2 = (120*5-300)/(5-2)
= (600-300)/3
= 300/100
botellas de 2 = 100
y botellas de 5 = 120-100 = 20
2d + 5c = 300 ec. 2
De la ec. 1:
d = 120-c ec. 3
Sustituyendo valores de la ec. 3 en la ec. 2:
2*(120-c) + 5c = 300
240-2c+5c = 300
3c = 300-240
3c = 60
c = 60/3
c = 20
De la ec. 3:
d = 120 - c
d = 120-20
d = 100
Comprobémoslo en la ec. 2:
2d + 5c = 300
2*100 + 5*20 = 300
200+100 = 300 comprobado
Respuesta:
se han ocupado:
100 botellas de 2 litros
20 botellas de 5 litros
Saludos.........