...In a certain group of 50 people, how many are doctors who...
Gmat - DI逐题精讲 - DS - A company makes and sells two products, P and Q. 03:11 Gmat - DI逐题精讲 - DS - The government of Nation X makes policy decisions intended 02:00 Gmat - DI逐题精讲 - DS - Was the number of b