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On a hypothetical scale X, the ice point...

On a hypothetical scale `X`, the ice point is `40^(@)` and the steam point is `120^(@)`. For another scale `Y` the ice point and steam points are `-30^(@)` and `130^(@)` respectively. If `X`-reads `50^(@)` The reading of `Y` is

A

`-5^(@)`

B

`-8^(@)`

C

`-10^(@)`

D

`-12^(@)`

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