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1.1: Writing ratios
Think about a ratio like a fraction, they are basically the same thing just that a ratio has a colon in the middle like this e.g. 5:7 When you say there are 17 blue marbles and 24 red marbles in a jar you can write it in ratio, 17:24. The order in which the ratio is stated is very important. The ratio of 1 computer to 20 games is written 1:20, not 20:1 which would mean 20 computers to 1 game, which is incorrect.
Remember to convert scales. For example 20mm:1cm should be converted to the smaller amount, in this case it would be 20mm:10mm.