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15 + x = 50
x= 50 - 15 = 35 cuadriculados
40 ( 15 + y)
--- =--------------------
5 35
40x 35 = 5 ( 15 + Y )
1400 = 75+ 5 Y
1325 = 5y
265 =y
Hay que añadir 265 cuadernos rayados