New ratio

The ratio of ducks and chicken in our yard is 2 : 3. The total number of ducks and chickens together is 30. Mother gave 3 of the chickens to our neighbor. What is the new ratio now?

Correct result:

r =  4:5

Solution:

 a+b=30 a=2/3 b  a+b=30 3a2b=0  a=12 b=18  r=ab3=12183=45=0.8=4:5



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