Q.

On a X temperature scale, water freezes at -1250X and boils at 375.0°X . On a Y temperature scale water freezes at 70.0° Y and boils at  30.0° Y. The value of temperature on X-scale equals to the temperature of 40.0° Y on  Y-scale is -------------- °X

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answer is 1250.

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Detailed Solution

From principle of calibration of thermometers 

X(LEP)1(UFP)1(LEP)1=Y(LEP)2(UFP)2(LEP)2x+125500=40+7040

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On a X temperature scale, water freezes at -1250X and boils at 375.0°X . On a Y temperature scale water freezes at −70.0° Y and boils at  −30.0° Y. The value of temperature on X-scale equals to the temperature of 40.0° Y on  Y-scale is -------------- °X