Question

A collector has 120 movie posters and 100 band posters. She wants to sell 24 movie posters but still have her poster collection maintain the same ratio of 120:100. If she sells 24 movie posters, how many band posters should she sell? Explain

Answer 1

Yes, the ratio      120 movie posters
                            ------------------------ must be maintained.  To use this info,
                            100 band posters   write an equation of ratios as follows:

120 movie posters         100 band posters
--------------------------- =  ---------------------------
   24 movie posters                        x

Then 120x=2400, or x = 20.

Is the ratio 20/24 the same as the ratio 100/120?  It MUST be.