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The oakdale preschool accepts 4 year olds and 5 year olds and has a total of 63 students. if the school has 7 more 4 year olds than 5 years olds, then how many of the children are 4 year olds?
Let's call the number of 4-year-olds "x" and the number of 5-year-olds "y". From the problem, we know that: x + y = 63 (because there are a total of 63 students) x = y + 7 (because there are 7 more 4-year-olds than 5-year-olds) We can use substitution to solve for one of the variables. From the second equation, we know that y = x - 7. We can substitute this into the first equation: x + (x - 7) = 63 Simplifying: 2x - 7 = 63 Adding 7 to both sides: 2x = 70 Dividing both sides by 2: x = 35 So there are 35 4-year-olds in the preschool.
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It is difficult to provide an exact number as population statistics are constantly changing. As of the latest estimates, there are approximately 1.2 billion 7 year olds in the world.
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