Answer:
[tex]20\ ducklings[/tex]
Step-by-step explanation:
Let
x------> the number of ducklings
y------> the number of adult ducks
we know that
[tex]x+y=24[/tex] ------> equation A
[tex]\frac{x}{y}=\frac{5}{1}[/tex]
so
[tex]x=5y[/tex]
[tex]y=0.20x[/tex] ------> equation B
Substitute equation B in equation A
[tex]x+0.20x=24[/tex]
[tex]1.20x=24[/tex]
[tex]x=20\ ducklings[/tex]
