A thermometer graduated according to a linear scale reads a value \( x_{0} \) when it contact wi....

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A thermometer graduated according to a linear scale reads a value \( x_{0} \) when it contact with boiling water,
P
and \( x_{0} / 3 \) when in contact with ice. What is the
W
temperature of an object in \( { }^{\circ} \mathrm{C} \), if this thermometer in the contact with the object reads \( x_{0} / 2 \) ?
(1) 25
(2) 60
(3) 40
(4) 35


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