Grandpa with his mischievous smile said:
"If zero belongs to One
And two belongs to Four
Twenty seven belongs to Seven
Then what belongs to Three?"
Hint
When I could not guess, I asked for a clue. He just smiled and said:
"Think Son"
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ONE
Explanation
Counting from the centre of the solar system, One (the Mercury) has zero moons, Four (Mars) has two moons, Seven (Uranus) has 27 moons
And
Three (Earth) has one moon
Hint:
Son is a synonym of Sun