Brain Teaser 10

Teaser 1: Insert the missing alphabets to complete the series.

T, F, S, E, T, T, F, _, _, _, _, T, T, T, T

Teaser 2: If you are supposed to take pills at half an hour intervals, how many minutes would 5 pills last?

Teaser 3: In a class test Tony scored 160 marks in Geography and History together. If one third of his marks in Geography equals to half of the marks he scored in History, then how much has he scored in History?

Teaser 4: Turn IX into 6 without lifting your pen.

Teaser 5: Cut a circular cake into 7 pieces with 3 cuts.