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Therefore, temperature drop in 1 day \[={{\left( \dfrac{15}{30} \right)}^{{}^\circ }}C\]

Now, using the simple unitary method:

Temperature drop in 10 days= (temperature drop in 1 day) $\times 10$

\[={{\left( \dfrac{15}{30} \right)}^{{}^\circ }}C\;\times {10}\]

$\Rightarrow{5}^\circ C$

Therefore, Temperature will drop by ${5}^\circ C$ in the next 10 days

A very important point in the question is that it is given that the rate of temperature drop is the same. If the rate of temperature drop was not the same, then we would not use this method to solve the problem. We may have to use integration methods to solve the problem.