Question

On an alien planet, the inhabitants are simiiar to human beings, however they differ in one respect-
either they have 3 heads and the normal amount of arms and legs (known as HEADERS) OR they
have one head and 3 legs and 3 arms (known as LEGGERS). Last week, I was talking to a group of
friends from the planet and between them they had 15 heads and 48 limbs (arms & legs). How many
aliens are there in that group? (Including headers and leggers)
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Answer 1

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Answer 2

????? not able to understand the question