It is found that on heating a gas its volume increases by 50% and its pressure decreases to 60% of its original value. If the original temperature was `-15^@C`, find the temperature to which it was heated.

Explanation

To solve the problem step by step, we will use the ideal gas law, which states that \( PV = nRT \). However, since we are comparing two states of the same gas, we can use the combined gas law:

\[ \frac{P_1 V_1}{T_1} = \frac{P_2 V_2}{T_2} \]

### Step 1: Identify the given values
- Original temperature \( T_1 = -15^\circ C \)
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