problem

### Which is bigger?

Which is bigger, n+10 or 2n+3? Can you find a good method of answering similar questions?

problem
###
Which is bigger?

Which is bigger, n+10 or 2n+3? Can you find a good method of answering similar questions?

problem
###
Which is cheaper?

When I park my car in Mathstown, there are two car parks to choose from. Can you help me to decide which one to use?

problem
###
Farey Neighbours

Farey sequences are lists of fractions in ascending order of magnitude. Can you prove that in every Farey sequence there is a special relationship between Farey neighbours?

problem
###
All-Variables Sudoku

The challenge is to find the values of the variables if you are to
solve this Sudoku.