Numbers Puzzles

45. Which number is the odd one out?
571219
461016
831114
461016
971613
781523
Answer
971613
Numbers are obtained by adding pairs of digits, ie with 571219.
5 + 7 = 12; 7 + 12 = 19.
To follow this same pattern 971613 would have to be 971623.
46. 16, 23, 19, 19, 22, 15, 25, ?
What number should replace the question mark?
Answer
11.
There are two alternate sequences: +3 and –4;
47. Which four figure number contains four different digits and meets the following criteria? The first digit is twice the value of the fourth digit and two more than the second digit. The third digit is one more than the first digit and four more than the fourth digit.
Answer
6473.