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On day 1, 55% of the people wore red shirts while the rest of the people wore white shirts. On day 2, when 520 new participants joined, the percentage of the people who wore red shirts became 70% while the people wearing white shirts doubled.

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The QN is about ratio and percentage and there is a before and after ratio so I use units and parts, changing the percentage to fractions. Which means the difference in the units and parts are because of the 520 participants

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1) we are supposed to find out the ratio of the number of people who wore red tshirts to white tshirts on day 2 and the number of participants who wore red on the second day.
2) we must find out what percentage does 520 represents.

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Follow the type of question

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Metacognition
Curiosity and Creativity

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Help us remember how to decide which method to use for that  question!

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The number of units each person has at first and in the end

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On day 1 55% of the people wore red while 45% wore white but on day 2 520 people joined and the 45% became 30% of the total amount of t shirts although it doubled. Out of the 520 people that joined on the second day, there were more participants wearing red tshirts than white tshirts.

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55% of the participants on day 1 wore red t-shirts while 45% of the participants wore white t-shirts
On day 2 the participants who wore red t-shirts became 70% and the number of participants who wore white shirt doubled.

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The number of units each person wearing red and white t shirts at first and at the end. The value of each unit.

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The number of people wearing white t-shirt at the start and in the end.

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This question makes use of ratio and percentage. In the same time it uses units and parts or the person could use models and find the difference because when the 520 participants joined the carnival the number of white t shirt wearers were doubled and so it should be 90% but the question said it was 30% and so we can only conclude that 90%on Day 1=30%on Day2 and then the equal concept also jumps in and then we could solve it more easily with these concepts that will be the solution the the question and so it is a before and after question.

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We are suppose to find the ratio of number of people who wore red to white and how many people wore red on day 2
We need to find how many people wore white on the day 1

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This question involves percentage so the base must always be 100%. This question also involves units and parts so we must make one of the unknown value the same to find out the other. Using this, we will then be able to solve the  question.

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Help us get use to the best method to solve the question.

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Critical and inventive thinking

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Lolz imma Justin Ling

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We are supposed to:
1. Write down the details of the question in ratio (understand it)
2. Find how many units is the 520 new participants on day 2

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This question is about percentage that involves units and parts. You need to multiply the units by 2 to find out the other one. Thus, you can find each unit and the difference.

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More practice on topics that I need to work on like speed and rates