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A couple of number puzzles from Mensa Brain Test


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75


Add column 1 and 3 and reverse digits to get column 2

 

8


Multiple numbers on left and subtract numbers on right

 

92


Multiply numbers on left then subtract product of numbers on right

 

6 & 5


2nd number is a multiple of x and third number is first + x
x decreases in each line from 4/3/2

 

Not sure about this one


If i had to guess, i would say 5867
This is the only number where 2nd digit is greater than the first

 

31


Add all numbers and reverse the digits

 

28


Add equal amount in digit on top and then to digit on right
Amount decreases 6/5/4

 

7


Add first and 2nd row digits, then subtract third row digit, then add 1
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