Robyn has 4 tasks to do and Sasha has 14 tasks to do. How many of Sasha's tasks should Robyn do in order for them to have the same number of tasks?
Solution
Between them, Robyn and Sasha have tasks to do. If each does the same number of tasks, each must do tasks. This means that Robyn must do of Sasha's tasks.
Want a route through all this instead of an archive? The track
puts 2,000 problems in a working order, from AMC 10 level to the IMO shortlist.