I could not solve a question from an online IQ test:
Transcription of image:
What is the number in the * cell?
The options were:
10, -5, 32 and 18
The only pattern that I managed to find was that the numbers went in an odd-even sequence(that means, odd-even-odd-even or even-odd-even-odd), so the missing number would be odd. The only odd number is -5, so the answer is -5. However, I don't really think that this is possible since there aren't any negative numbers in the grid, and even if it is, there must be a better way of solving. Can someone tell me what is the correct answer and reasoning? Thank you.
Source: Arealme IQ Test