CREATE TABLE table_50751 ("2010 ARWU Rankings" TEXT, "2010 QS World Rankings" TEXT, "2010 QS Asian Rankings" TEXT, "2010 eduniversal Rankings" TEXT, "2009 QS Asian Rankings: Intpars_m_singlel faculty review" TEXT, "2009 QS Asian Rankings: Intpars_m_singlel student review" FLOAT, "2000 Singapore \\u201cAsiaweek\\u201d Rankings" TEXT, "University" TEXT, "Local" TEXT, "Median ranks" FLOAT)

What's the int'l student review that has the 2010 QS Rank of none?
SELECT SUM("2009 QS Asian Rankings: Int\u2019l student review") FROM table_50751 WHERE "2010 QS Asian Rankings" = 'none'
SELECT SUM("2009 QS Asian Rankings: Int\u2019l student review") FROM "table_50751" WHERE "2010 QS Asian Rankings" = 'none'