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Ratios and proportions

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Please explain the following ratios and proportions:

1) 45 cm to 1 m
2) 10xy+ 2y/4y
3)(9x-6y)/3
4)(2x*2y/4y)
5) (x+y)/(x*2-y*2)
6) (x*2+7x+12)/(x+4)

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This provides examples of working with ratios and proportions.

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1. 45 cm to 1 m means 45cm to 100 cm which again means ...

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