Mr. Thompson builds a treehouse with his two children in fifteen days. How long does it take Mr. Franklin and his four children to build a similar treehouse?
Half of 15 = 7.5 days 2=15 So add 2 to 2 and divided it by 15 because it take him and his to children 15 days so half of 15 is 7.5 because he had for of then now !