SOLUTION: a farmhouse has 15 animals. Some are goats and some are ducks. altogether there are 48 legs. how many of each animal are there?

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Question 201451: a farmhouse has 15 animals. Some are goats and some are ducks. altogether there are 48 legs. how many of each animal are there?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
D+G=15 OR D=15-G
2D+4G=48
2(15-G)+4G=48
30-2G+4G=48
2G=48-30
2G=18
G=18/2
G=9 NUMBER OF GOATS.
15-9=6 DUCKS.
PROOF:
9*4+6*2=48
36+12=48
48=48