user: Question: What was the world rank by ARWU in 2013 of university whose world rank by QS in 2013 was 90th?
Columns: ['Members', 'Country', 'Year Established', 'World Rank by THE-WUR , 2013', 'World Rank by ARWU , 2013', 'World Rank by QS , 2013']
Types: ['text', 'text', 'real', 'text', 'text', 'text']
Sample row: ['Dartmouth College', 'USA', 1769.0, '126th', '151–200th', '113th']
SQL:

assistant: SELECT "World Rank by ARWU , 2013" FROM "Table" WHERE "World Rank by QS , 2013" = '90th';