There are 99 heads AND legs among some ducks and goats. There are two times as many ducks than goats.?

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How many animals are there?

2006-11-02 15:01:29 · 2 answers · asked by mushroomtop123 2 in Science & Mathematics ➔ Zoology

18 ducks and 9 goats= 27 animals

2006-11-02 15:06:28 · answer #1 · answered by Angelica G 3 · 0⤊ 0⤋

d+g+(2d+4g)=99
d=2g

2g+g+(4g+4g)=99
3g+8g=99
11g=99

g=9, you have 9 goats
d=18, you have 18 ducks
d+g=27 animals

2006-11-02 15:38:32 · answer #2 · answered by Scooter_MacGyver 3 · 0⤊ 0⤋