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Total sillas = x
Total bacos = 43 - x
Total patas .
Patas de sillas = 4x
Patas de Bancos = 3( 43 - x)
4x + 3( 43 - x) = 147
4x + 129 - 3x = 147
4x - 3x = 147 - 129
x = 18
Total sillas = x = 18
Total bancos = 43 - x = 43 - 18= 25
Respuesta.
Hay 18 sillas y 25 bancos