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For any given scale X, the ice point is ...

For any given scale X, the ice point is `40^@` and the steam point is `120^@`. For another scale Y, the ice point and steam point are `-30^@` and `130^@` respectively. If X reads `50^@`, then Y would read

A

`-5^@`

B

`-8^@`

C

`-10^@`

D

`-12^@`

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