Can You Solve Tricky Geometry Problem From JAPAN ?

Can You Solve This Problem ? x^(x^(x^2017)) = 2017

Problems based on Geometry

Mahesh has certain number of problems with him. He can solve some fixed number of problems every hour. After solving for 5 hours, he is left with 384 problems. If he had solved for 10 hours, he is left with 144 problems to solve. Find the number of problems with Mahesh initially.

Basic Coordinate geometry and locus problems and different forms of line

A can solve 90% of the problems given in a book and B can solve only 70% problems. What is the probability that at least one of them will solve the problem selected at random from the book?