Brianna nicholas at painting birdhouses to sell at the school carnival brianna can paint 5 of the smaller bird houses in 3 hours nicholas can pay three of the larger bird houses in 4 hours if the same rates continue how many more birdhouses will brianna have painted the nicholas in 12 hours. use the double number line diagram to solve the problem

With five houses every three hours, Brianna will paint 20 houses in 12 hours. 12 hours / 3 hours = 4 'rounds'. 5 houses * 4 rounds = 20 houses. With three houses every four hours, Nicholas will paint 9 houses in 12 hours. 12 hours / 4 hours = 3 'rounds'. 3 houses * 3 rounds = 9 houses. So Brianna will paint 20 - 9 more houses than Nicholas, or 11 houses more.

D.