On Thursday morning a bakery owner prepared by baking several pies and
decorating cupcakes. She spent 90 minutes baking the pies and an average of
1.2 minutes decorating each cupcake. On Friday, she spent 58 minutes baking
pies, and decorated the same number of cupcakes at an average of 1.7 minutes
per cupcake. If she spent the same total amount of time preparing on Thursday
as she did on Friday, how many cupcakes did she decorate each day?