Question 134235
Let x=number of robins that visit
Now we know that out of every 11 birds, there are 4 robins, so:

4 is to 11 as x is to 132 and this is written as follows:

4/11=x/132  cross multiply (or multiply each side by 11*132)

4*132=11x
528=11x  divide each side by 11

x=48 --------------number of robins that visit

CK
4/11=48/132

4/11=4/11

Hope this helps---ptaylor