1 / 4 of 1500 chickens and ducks raised in a farm is 15 less than 40 / 100 ducks (equation)

Chicken x duck is 1500-x
1/4x＝0.4（1500-x）-15
0.25x＝600-0.4x-15
0.65x＝585
x＝900
Chicken 900 duck 600

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