Set up ratios to compare each of the following sets of quantities. Reduce each ratio to its lowest terms.
(a) twenty-five dimes and three dollars
(b) five hours to 50 min
(c) $6.75 for thirty litres of gasoline
(d) $21 for three-and-a-half hours
(e) 1440 words for 120 lines for 6 pages
(f) 90 kg for 24 ha (hectares) for 18 weeks