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

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