What single percentage change is equivalent to a 11% increase followed by a 15% increase?

What is a possible solutions of the x> 3?

Seymour is twice as old as cassandra. if 16 is added to cassandra’s age and 16 is subtracted from seymour’s age, their ages become equal. what are their present ages? show !

Laura read 1/8 of a comic book in 2 days. she reads the same number of pages every day. what part of the book does she read in a week