Logical Thinking

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?




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Find the next number in the series below

21 32 54 87 131 ?

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Can you figure out the logic I used to decide the order of the following words:
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The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

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In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
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ABDBAA
------- +
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