What is the ratio of a:b, knowing that a-b/a+b=3/5

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Hector and alex traded video games. alex gave hector one fourth of his video games in exchange for 6 video games. then he sold 3 video games and gave 2 video games to his brother. alex ended up with 16 video games. how many video games did alex have when he started?

In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog