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numero de gallinas = 50-x
4x + 2(50- x) = 170
4x +100 -2x = 170
2x = 170-100
x = 70/2
x = 35
hay 35 curies
gallinas = 50- 35 = 15
hay 15 gallinas
comprobacion
4*35 +2(50-35) = 170
140+2*15 = 170
140 +30 =170
170 =170
r
respuesta
curies hay 35 (xxxv)
gallinas = 15 (xv)