SOLUTION: The ratio of robins to blackbirds that visit our feeder 4 to 7. If there are a total of 123 birds, how many robins visit the feeder? (show your work)

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Let there be 'x' robbins and 'y' blackbirds.
As the ratio of robbins to blackbirds is 4:7, so

or

Also total no. of birds = no. of robbins + no. of blackbirds = x + y = 123 (given).

Thus we have two unknowns (x & y) and two equations to solve.
______(1)
______(2)

Substituting the value of 'y' from (1) in (2),

or
or
or x = a fraction.

The number of birds cannot be fraction they have to be positive integers.
So, your question has erroneous data.
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