选择A:farmer has some pigs and some ducks.there are 9heads and26feer.

问题描述:

选择A:farmer has some pigs and some ducks.there are 9heads and26feer.
A:farmer has some pigs and some ducks.there are 9heads and26feer.
How many pigs are there?A.3 B.4 C.5 D.6

Its B.4
There are 4 Pigs,thats 16 and 5 Ducks,and that is 10 and 16 + 10 = 26 ,and that is the only one in them that adds up to 26.