hard

How can the number four be half of five?
Common Wrong Answers
“2”
The number 2 is not mathematically related to the number 4 or 5 in a way that would make sense in the context of the riddle.
“10”
The number 10 has no direct connection to the relationship between 4 and 5 as described in the riddle.
“3”
The number 3 is unrelated to the riddle's play on words and does not fit into the concept of 'half' of five.
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Is there a number which, when written as a word has same number of letters as its numerical value?
hard
If half of five was two what would a third of ten be?
medium
Three matches are sitting on a table. Without adding another make the three matches four. You are not allowed to break any of the matches.
hard
Take 9 from 6, 10 from 9, 50 from 40 and leave 6.