Hi,

I need to do some psychometric tests, I've been told to practice as much as I can. My problem is I've been sent examples to practice, but they haven't given any answers, so when I can't figure it out I can't use the answer to work out the strategy.

1) I need to figure out the bottom right number:

                4        2        9

                6        3       10

               10       5         ?

The answer is one of these: 21 / 12 / 16 / 15 / 11

2) I have 3 boxes with 4 numbers, and need to find the last number in the last box:

             16       5                  12      3                  9       5

              4      17                   5     16                  2       ?          

The answer is one of these: 15 / 17 / 10 / 13 / 18

When I find a pattern with these, it is too weak to be correct, I just can't see a real pattern.