【怪盗基德KID在大作中谈到:】 > > As I was walking my dog to the market,I met an elderly couple going in the opposite direction with their 3 sons and 3 daughters.Each son had 2 dogs of his own and each dog had 3 fleas .Each daughter had 2 cats and each cat had 2 fleas.In total,how many persons,animals and fleas were going to the market?