a group of goats and ducks have a total of 99 heads and legs amoung them there are twice as many ducks as there are goats.how many are there of each?

Each duck will have 3 (1 head, 2 legs) and each goat will have 5 (1 head, 4 legs)

18 ducks (18 X 3 = 54)
9 goats ( 9 X 5 = 45)
total = 99

Sra