The number of chickens to the number of ducks on a farm was 6:5. After 63 ducks were sold, there were 3 times as many chickens as ducks left.

C:d=6:5

63 ducks sold

then the ratio is not

3:1

so

3:1 times 2:2=6:2

so from 6:5 then 63 weere sold becomes 6:2

therefor 3 duck units=63

therefor

3/63=1/21

1 unit=21

there is not question so I will solve for

1. total number

2. original numbe rof chickens

3. original number of ducks

4. final numbe rofo ducks

total number=total units times number per unit

number per unit=21

ttoal units=5+6=11

21 times 11=231

total=231

chickens=6 units

6 times 11=126

original ducks=5 units

5 times 21=105

resulting number of ducks

2 units

2 times 21=42

total=231

original chickens=126

original ducks=105

final number of ducks=42