A person decides to walk for 18 minutes one day, and then increases his walks by 3 minutes each day for a month. Let $a_{1}, a_{2}, \cdots, a_{n}$ be the sequence showing the length of time he walks each day, where $a_{n}$ is the length of time he walks on day $n$, and let $S_{1}, S_{2}, \cdots, S_{n}$ be the sequence of partial sums. What is $S_{27}$ ?

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The Answer of A person decides to walk for 18 minutes one day, and then increases his walks by 3 minutes each day for a month. Let $a_{1}, a_{2}, \cdots, a_{n}$ be the sequence showing the length of time he walks each day, where $a_{n}$ is the length of time he walks on day $n$, and let $S_{1}, S_{2}, \cdots, S_{n}$ be the sequence of partial sums. What is $S_{27}$ ?

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A Person Decides to Walk for 18 Minutes One Day $a_{1}, a_{2}, \cdots, a_{n}$