Respuesta :

sdyadav464

answer 10.8

Step-by-step explanation:

let the book in shelf is 2x

then the copies in shelf is 3x

2x+3x equal to 18

5x equal to 18

x equal to 18/5

x equal to 3.6

number of copies equal to 3x

equal to 3(3.6)

equal to 10.8

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