Frustratingly, there's no easy answer. Many have offered guesses, but no clear answer has surfaced. One user skips the complex equations and suggests a simple answer. The user submits one possible solution is that the numeral in each blank circle should equal the number of double-digit quadrants the circle touches.
Mashable contacted Singapore's Ministry of Education to verify the source. The Ministry wasn't much help. "From the image, we are unable to ascertain if the question was from a school’s Primary 1 examination paper," it responded.
The publication also notes a striking similarity to a puzzle posted by Gordon Burgin, an author of math puzzles. The answer to his puzzle is too complicated for the average first grader. But the similarity between the puzzles is so pronounced it seems like this is all just a sadistic ploy. Good luck.
h/t Mental Floss
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