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-The fraction of the blue tiles of the green tiles is 1 over 1

-The ratio of the green tiles to blue tiles is 1 to 1



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-The fraction of the red trays of the blue trays is 1 over 2

-The fraction of the yellow trays of the blue trays is 1 over 2

-The ratio of the red trays to the blue trays to the yellow trays to the grey trays is

1 is to 2 is to 1 is to 1



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-The fraction of the green shelves of the yellow shelves is 1 over 1

-The fraction of the blue shelves of the red shelves is 1 over 1

-The ratio of the green shelves to the blue shelves to the yellow shelves to the red shelves is 1 is to 1 is to 1 is to1


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The ratio of the number of opened doors to that of closed doors is 1:4.

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The ratio of the number of red house pupils to that of green house pupils is 2:1.