At a gallery, there is a photography exhibition. The ratio of portrait to landscape
photographs on show is 5:3
60% of the portrait photographs are in
colour. 24 of the portrait photographs are
not in colour.
Work out the total number of photographs
at the exhibition.

Your vet has placed your pet on a diet. the diet is to contain at least 12 mg of fat and at least 14 mg of protein per serving. these requirements are to be obtained from two food sources. source a contains 2 mg of fat and 2 mg of protein per serving. source b contains 1 mg of fat and 3 mg of protein per serving. if source a sells for $1.28 per serving and source b sells for $1.12 per serving, how many servings of each type should be purchased to satisfy the requirements at minimal cost?