Deanna has 80 books in her collection. if 60% of the books are fiction, how many of the books are nonfiction?

if 60% is fiction, then 40% are non fiction

80 x 40% =

80 x 0.40 = 32

 32 books are nonfiction

Contractor's crew can frame 54 houses in 18 weeks.

Explanation:-

Time taken to complete 3 houses=1 weeks

⇒Time taken to complete 1 house= week

⇒Time taken to complete 54 houses = weeks

=18 weeks

Therefore, contractor's crew can frame 54 houses in 18 weeks.