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Sabemos 22 2/5 = 112/5 y 20 3/9 = 183/9 ... Luego sumamos y homogenizamos los denominadores: 9/9(112/5) + 5/5(183/9) = 1923/45 = 42 33/45 = 42 11/15
22 2/5
(22 * 5 + 2)/5
(110 + 2)/5
112/5
------------------------
20 3/9
(20 * 9 + 3)/9
(180 + 3)/9
183/9--simplificamos
61/3
Listo sumamos las fracciones obtenidas.
112/5 + 61/3--sacas el mcm = 15
336 + 305 641
-------------- = ------------
15 15
Solución :
Todos los rollos juntos miden = 641/15