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6,8 x10^9 es la poblacion, osea
=>6.800.000.000
entonces le sacamos el 5%
6.800.000.000x5%
=6.800.000.000x5/100
=34.000.000.000/100
=340.000.000 tienen perros
RTA/ asi que 340.000.000 tienen perros ó 3,4x10^8 tienen perros