It takes a crew of 4 painters 12 hours one house. If they wanted to paint the house in 8 hours, how

It takes a crew of 4 painters 12 hours one house. If they wanted to paint the house in 8 hours, how many additional painters must they hire?

It takes one painter 4 * 12 hours = 48 hours to paint the house.

Now we calculate the unit rate:
48 hours / 8 hours = 6 painters

6 painters - 4 original painters = 2 additional painters