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Nezavi [6.7K]
4 years ago
12

Luis ha regalado la mitad de los DVD que tenía a Juan. Después,le ha dado la tercera parte de los que le quedaban a su hermana.

Al final sr haquedado con 6 DVD. ?Cuántos DVD tenía al principio?
Mathematics
1 answer:
sleet_krkn [62]4 years ago
4 0

Answer:

había 18 DVDs al principio

Step-by-step explanation:

si procedemos desde el final del problema , sabemos que :

total que le quedaba después de darle los CDs a Juan - lo que fue para la hermana = lo que le sobró

x  -  x/3  = 6

2/3*x = 6

x= 6 * 3/2 = 9

por lo tanto tenia x=9 DVDs después de entregarle a Juan los suyos

también sabemos que

DVDs que tenia al principio - lo que fue para Juan = 9 DVDs

y - y/2 = 9

y/2 = 9

y= 18

finalmente había y= 18 DVDs al principio

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