climb a mountain which is 12000 feet high She plans to climb

climb a mountain which is 12,000 feet high. She plans to climb 3000 feet each day, before taking overnight rests. A mischievous mountain spirit, however, decides to test Brenda\'s resolve. Each night, Brenda

If Brenda is climbing 3000 feet everyday, and every night the spirit brings her down 2000 feet, for the first 8 days she is only ascending 1000 feet, but by the 9th day she reaches the top. Answer is 9 days.