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Rojas
7/20 de 320
7 7 x 320
--- x 320= ------------ = 112 canicas
20 20
Verdes
2/5 de 320
2 2 x 320
-- x 320 = ---------------=128 canicas
5 5
Amarillas el resto:
320 - ( 112 + 128 )
320 - 240
80 canicas