A farmer has some pigs and some ducks.There are 9 heads and 26 feet.how many pigs are there?
问题描述：
A farmer has some pigs and some ducks.There are 9 heads and 26 feet.how many pigs are there?
答
鸡兔共笼题
4 pigs
5 ducks
答
The farmer has four pigs .
答
4
答
i got it
the farmer has 5 pigs and 4 ducks,
答
猪x 鸭y
x+y=9
4x+2y=26
x=4
y=5
答
4 p
5 d