Scarlett and Tristan are both running for student council president. At the start of the last day of voting, Tristan had half as many votes as Scarlett. Throughout the day, Scarlett gained 11 more votes, while Tristan gained 34 more votes. By the end of the day, Scarlett and Tristan had the same number of votes.

How many votes did Scarlett have at the start of the last day of voting?
votes

1 answer

Let \( S \) be the number of votes Scarlett had at the start of the last day of voting, and let \( T \) be the number of votes Tristan had at that time. According to the problem, we have the following information:

  1. At the start of the last day, Tristan had half as many votes as Scarlett: \[ T = \frac{1}{2} S \]

  2. Throughout the day, Scarlett gained 11 votes, and Tristan gained 34 votes. By the end of the day, they had the same number of votes, which gives us the equation: \[ S + 11 = T + 34 \]

Now we can substitute the first equation into the second equation. Since \( T = \frac{1}{2} S \), we can substitute that into the second equation: \[ S + 11 = \frac{1}{2} S + 34 \]

Next, we need to eliminate the fraction by multiplying everything by 2: \[ 2(S + 11) = 2\left(\frac{1}{2} S + 34\right) \] This simplifies to: \[ 2S + 22 = S + 68 \]

Now, we can isolate \( S \) by subtracting \( S \) from both sides: \[ 2S - S + 22 = 68 \] This simplifies to: \[ S + 22 = 68 \]

Subtracting 22 from both sides, we find: \[ S = 68 - 22 \] \[ S = 46 \]

Thus, Scarlett had \(\boxed{46}\) votes at the start of the last day of voting.

To ensure our solution is correct, let's calculate the initial number of votes for Tristan: \[ T = \frac{1}{2} S = \frac{1}{2} \times 46 = 23 \]

Now, let's consider how many votes each candidate has by the end of the day:

  • At the end of the day, Scarlett has: \[ 46 + 11 = 57 \]
  • At the end of the day, Tristan has: \[ 23 + 34 = 57 \]

Since they both end up with the same number of votes (57 votes), our solution is verified: Scarlett had \(\boxed{46}\) votes at the start.