Question 925276
x the number of chickens as well as the number of ducks
20x + 30x + 50(50-2x) = $1500
-50x = -1000
x = 20, the number of chickens as well as the number of ducks.
........
20 chickens, 20 ducks and 10 Dogs {{{50-20-20}}}
And...checking
$400 + $600 + $500 = 1500