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해법
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The sum of two numbers is 65 . One number is 4 times as large as the other. What are the numbers? Larger number: Smaller number:John is 4 times as old as Martha. Five years ago, the sum of their ages is 50. Find their present age.A ticket costs 75. A fee of 10% is added to the price. Which calculation will give you the new price?A population doubles every 10 years how long will it take for the population to increase by 35%The sum of two numbers x and y is 52. The 차이 between the two numbers is 8.Find the values of x and y.