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Step-by-step explanation:
10 workers need 3 days to build 1 house then 1 worker needs 3 x 10 = 30 days to build 1 house.
So rate of work is 1 house / 30 worker days effort
So with 15 workers you get this 30 worker days effort in 30/15 = 2 days
So 15 workers would need 2 days to build a house
At this rate, to build 4 houses 15 workers need 4 x 2 = 8 days.
But this is if life was only maths. In real life 15 workers may take more time than 10 workers due to other factors like relevant skill set & team coordination.
PS: hope that am not doing someone's homework here