16. Samuel and Lena both plan to run for a spot on the school board in their city. They must each collect a certain number of signatures to get their name on the ballot. So far, Samuel has 20 signatures, but Lena just started and doesn't have any yet. Samuel is collecting signatures at an average rate of 16 per hour, while Lena can get 20 signatures every hour. Assuming that their rate of collection stays the same, eventually the two will have collected the same number of signatures. How many signatures will they have when this happens?