How many roll-up summary fields can be created in Salesforce?

A roll-up summary field calculates values from related records, such as those in a related list. You can create a roll-up summary field to display a value in a master record based on the values of fields in a detail record.

The types of fields you can calculate in a roll-up summary field depend on the type of calculation. For example,Number, currency, and percent fields are available when you select SUM as the roll-up type.
Number, currency, percent, date, and date/time fields are available when you select MIN or MAX as the roll-up type.

You can add 25 roll-up summary fields per objects in salesforce.

What if the master object has 20 roll-up summary fields and a new managed package installing has 10 roll-up summer fields on the same master object?? managed package install successfully or else??