Can you pass this Mathematics quiz?
Mathematics
1.34 M People
Took This Quiz
7 is changed to 13. 11 is changed to 21. Then what does 16 become?
32 31 20 17
Hot Quizzes Trending Now
History
1 M  Players
Which scientist developed his theories of black holes in the 1970s?
1980s
3.96 M  Players
Which Madonna song first hit the US Billboard Hot 100 in 1983?