Respuesta :

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x=# of Hillary's books. Deanna has 3x. together they have 60
x+3x=60
4x=60
x=15
Deanna has 3*15 or 45 books

Hilary has x books.

Deana has 3x books.

Altogether (x+3x) books.

3x+x = 60

4x= 60

x= 15

Deana has 3x = 3*15 =45

Answer: Deana has 45 books.