SingaporeMath - Ratio ; Difference Remains the Same

For more Singapore Math problems check out my channel at https://www.youtube.com/@inspiredLearning This video goes through the concept behind the solution and then implements the concepts to solve an actual ratio problem using Singapore Math techniques using models. The problem being solved in this video: Jason has 6 times as many stickers as Mary. If each of them buys another 20 stickers, Jason will have 4 times as many stickers as Mary. How many stickers does each of them have?