Selma packs one box in 5 minutes and has already packed 12 boxes. her friend trudy packs one box in 7 minutes and has all ready packed 18 boxes. how many more minutes does each need to work in order to have packed the same number of boxes?

Dexter read 11 science fiction books and 5 history books. lena read 9 science fiction books and 4 history books. compare the students’ ratios of science fiction books to history books. 1. determine the ratios’ form:    science fiction books to history books 2. write the ratios as fractions:    dexter: 115; lena: 94 3. rewrite with a common denominator. 4. compare. 5. answer the question. determine which shows the correct comparison of the ratios for this problem.