There are 23 ducks and pigs, and the total number of legs of ducks and pigs is 74. How many ducks and pigs representatively?

• 若有23只鸭，那么共有46条腿，与74相差28。若把其1只鸭换成1只猪，那么共有48条腿，与74相差26。因此猪的数目等于28(2=14只、鸭的数目等于9只。