This graph shows the number of stamps that Riordan collects from 5 countries. He collects a total of 27 stamps.
- Riordan has _____ Russia and India stamps.
- Riordan has _____ more Oman stamps than Japan stamps.
- Riordan has _____ Australia stamps.
- Riordan has the greatest collection of _____ stamps. Give the answer in number. (Eg 1)